HIGHIGHTS
of agricultural research
VOL, 20, NO 4 WiNTFR
Agricultural Experiment Station
AUBURN UNIVERSITY
-4
Ik
- '~4
DIRECTOR'S COMMENTS
IN THE SPIIING ISSUE of Highlights I asked readers of the
Director's Comments to support legislation for funds to improve
the Main Station field research facilities at Auburn. I know the
funding of this by the Legislature and Covernor Wallace was a
response to the effort and encourage-
ment of many people in Alabama who
appreciate the importance of agricul-
ture and of agricultural research to
the future of this State. Therefore, o i
behalf of all of agriculture - THANK
YOU!
With this kind of active interest
Alabama will continue to move to-
ward the forefront agriculturally ill
this Nation. TIhe future of Alabanma
agriculture is indeed bright!
Il the last issue of Highlights I
noted some implications of the change
in availability of agricultural products. R. DENNIS ROUSE
The change from viewing agriculture
as a financial liability to the hope of
the Nation, by those in leadership positions, looms greater today
than could have been anticipated 3 months ago. To illustrate this
point I can quote a recent statement by Dr. Phillip lHandler, Presi-
dent of the National Academy of Science: "The future of this
country is in agriculture and the future of agriculture is in re-
search." President Nixon has said food was the foremost topic in
his meetings with the leaders of China and Russia. The export of
agricultural products is viewed by our government as the hope
for a balance of trade. Secretary of Agriculture 
Butz recently said,
"We dare not chance not enough agricultural production."
Last year exports of agricultural products ainounted to $12.9
billion. We must meet the essential food needs of the people of
the United States first, but last year the products of nearly 1 acre
out of 4 went for export. With increased export demand and re-
inoval of acreage restriction, this ratio should narrow. Alabama,
through the port of Mobile, has unequaled export potentials. Ala-
bama must rapidly develop its transportation systems and port
facilities for export.
\Vith the projected increased need for overseas petroleum, our
agricultural export would need to be doubled by 1985 just to
balance the purchase of petroleum. This Nation with 6% of the
petroleum supply is using 33% of the xworhkl production of pe-
troleum. Although agriculture uses only about 3% of the total
fuel consumption in this Nation, it will play a vital role in our
present projected energy shortage. Food is the most vital thing on
earth! It is in the same category with air and water as a basic
requirement of human life. This means the energy required for
agriculture must have a high priority, not only for the production
of domestic needs but also for export.
The only approach that can be effected immediately to meet anl
energy shortage is conservation of use, producing agricultural
products for export to the maxinmun of our capacity 
to strengthen
the purchasing power of the U.S. dollar abroad, and transporting
these products most economically.
The agricultural research at this Station will include as a high
priority area of concern the use of available fossil fuel with maxi-
mum efficiency in agriculture.
u re bta4oduce ...
James I. Stallings, 
associate professor
of Agricultural Economics and Rural
Sociology. Dr. Stallings was raised on a
farm in southwest Indiana. He earned
B.S. and M.S. degrees
from Purdue University
and the Ph.D. from Michi-
gan State University. Dr.
Stalling's major fields of
study include farm 
man-
agement, production econ-
omics, agricultural market-
ing, and economic de-
velopinent of under-developed areas.
Dr. Stallings teaches undergraduate
and graduate level courses at Auburn
and is currently doing research work on
grain marketing, forage harvesting sys-
tems, least cost dairy rations and dairy
waste disposal, the last of which is fea-
tured on page 3.
Prior to coming to Auburn 
on July 1,
1969, Dr. Stallings was Head of the
Rural Economy Department at Morogoro
Agricultural College in 
East Africa,
which is a new college modeled after
U.S. land grant universities. He also
has served as a Station Statistician at
WVest Virginia University; Chief of the
Farm Products Branch, Agriculture Di-
vision, U.S. Bureau of Census in Mary-
land; Economist with the U.S. Depart-
ment of Agriculture; and as an Assistant
Professor of Agricultural Economics at
New Mexico State University.
HIGHLIGHTS of
Agricultural Research
WINTER 1973 VOL. 20, NO. 4
A quarterly report of research published
by the Agricultural Experiment Station
of Auburn University, Auburn, Alabama.
R. DENNIS ROUSE - --- Director
IRvIN T. OMTVEDT Associate Director
CHAs. F. SIMMONS Assistant Director
T. E. CORLEY Assistant Director
E. L. McGRAw-V- . .. Editor
R. E. STEVENSON Associate Editor
RoY ROBERSON- Assistant Editor
Editorial Advisory Committee: IRvIN T.
OMTVEDT; JOHN LAWRENCE, Professor of
Fisheries and Allied Aquacultures; Ron-
ERT N. BREWER, Assistant Professor of
Poultry Science; H. S. LARSEN, Associate
Professor of Forestry; AND E. L. Mc-
GRAW.
Auburn University is all equal opportunity
employer.
ON THE COVER: Lagoon waste disposal sys-
tem proved efficient in tests. See story on
page 3.
i I ol'sl5 551 )1510) hai oil(,u hcel it lii )1leili ofth
dlaii xmani. Since 1969, scien tists of' the Agriciiltuiial Elxp 'i
mrent St atio m hav e xttildied fou r sy sterms of disposal to hlpi
Solve this prolemi.
Txxo sx stemrs xx ere studied at. the Colt Coast Suilstationi
(I) thle "conv enional" sx xteml uising i Inotoi i'd Scra.peri
loader and at mlanulre spreader, and (11I) at flish iriiutioi I 555
temt wxhli mh eovd fluishiiig wxaste inito a lioldiiig tai k flnuii
wh li ch it wxias sprinkler irijgatedh ointo fieldcs. The th ird a ii c
foinrth xsystems xwere a xcmi-liquid hauil sy stein at the Noi tli
Auburn c Dairy Unit risinig a lioldiiig tank aiid a taiik xpi -,afhi
(111), aiid a twxo-stage. flush-lagooni sy stem at the Black Belt
Substatioin (IVs). Sxstemns I aid iI xxeire complete cotiiciniai
svstcl1 in eqilii bg remoxval of all the xx aste xx lile Ill aim! IN'
wxei-e partial c-oiifiiieineiit sx x tc is aiid i (Iiiiiie pios lxll for
wxaste dispaisal old d 7iiii g iiilkiiigs -appiroxinmately oile isitli
oIf the time. Trliei efore, thle dliflereiit s teiiix lie not) litfi clx
ExTIxIA- iii) T'1) AL CoS'x ix i COW PEc YEA Fi iiio Sx xii- x 0:,
DAIRY WAS FE DISPOSAXL ANiD VN IiNG. Nc MBIt- 01' COw x
HANDLED Pi-R YEAt, ALA MA ilxis119972
Annui al coxt v -i ecow foi:
Ax'. no. - Complete cocif.
cows Conx 
cii 1Flush
tionnal ir-.
D~ol. Dol.
30 40.10 6:3.37
60 -- ----- 29.4~ 2 14.1
90 -- -------- 25.84 :35.00
120 ----- 24.07 :30.31
150 ---- 23.01 27.42
180 ------ 22 13 25.62
211) --- 21.78 24.56
240 2:3.76
2,0001.8
Ptii conf.
21.:31
14.60-
14.63
1:3.18
12.59
12.65
1:3.81
16.56
Sei
Iliid
31.31
25.56
22.66
21.21
20.32
19.7:3
19.32
19.02
' Does not ii cli i e c-ist of aeirator tI ron lh lit-id xize of 6(0 cows.
Coxt of aeirator xxax includedl startig at 906 c-oxvs.
comparalble hutt may he possible alternatixves oii a pairticuolar
farm.-
Initial costs inl 1969 for sx stemis 1, 1ll, aiicl IV xx eie ionl
comparable at $6,31 8, $7,662 ( iiclncliioc aerator co(st of
$2,407), and $5,879, respectively.. Sy stei 11 had anl iitial
cost of $15,482.
The conventionjal system xxas the cheaper per co1w of
thle two conflitrimtit systems for- herd sizes iop to 240 1i xvs
FIG. 1. Flush system of dairy wastL 6isposal us,.d at the Gulf
Coast Substation.
ECONOMICS of DAIRY WASTE
DISPOSAL SYSTEM for ALABAMA
JAMES L. STALLINGS
De~partment of Agricultural Economics and Rural Scciclogy
T. A. McCASKEY, G. H. ROLLINS, and J. A. LITTLE
Department of Animal and Dairy Sciences
aiid solinew5hat bevoiid, seec talei ,nl l-n.yire 2. No piractical
l)1)l'i linmit ill tows lnmbers wxax cleterii cl foi- this s',stein.
l lowx cxci cost per coxw for thle flis- in iga t i) sy5stem liecaie
I iNcr anid ex ciat Ially chl eapler th ain tlit(, coei xctional s~ st ei
as h erd siti iiici eased hex o4id 240) cowsx.
All eqilipicit 1701 the convenition al sxystem wnxas uised olyl
f0r tit( e ir n vctelrp rise andic all costs were charged to it.
This is prolbably not ty pical for this system oii actual farms
wxlici e cqloipinei it mlay be uised tor otheri purposes, or aii
existil ig tractor mnax lbe ulsed wxithi a scraper-loader attach-
inci it in stead ot tile mnotoizied xci aper-loader. Iii suich a
case, cost per coxw for the cohnventionial system mright mean
tha~t it wxas the cheapest systemi of dairy waste disposal for
pairticuilar cases.
'T'le flilsh-lagoon svstem wxiax the chicaper of the partial
cmi ifii cinei t sYstemrs ill) to its capacitN' of about 2401 cowvs.
AnnuoI cosi pe, cow
(do Ilnord
70f-
60-
50-
40-
0 30 60 90 120 150 180 2;0 240 2000 1
Herd Size ( No of cows)
FIG. 2. Estimated total cost per cow for four systems of dairy
waste management for various herd sizes, Alabama 1969-72.
H oxwexer, both partial -oiifinumeiit sy steims xveie cheaper
thiaii thle twxo complete confinement sys~erns for this size
11' a laigooii is adopted, f airmers should knowx that coil-
sri c-tio i peirm~iinits are i-c(tti i cc by regulatory agencies iii
iiost areas mic rec-ommeiidations of exp~erts concerning size.
xiut abilit , of the soil, anud oither aspects (if coiixtrutctioi) should
hc- obsci N Cl. Also, the limit (if 240 t-oxvs for the lagooii iii
(hIis stucl' c-mild he incieased 1y coistructing more or larger
laigooiiis. Whulatexer its size, anl aerator wyill lbe inecessary for
aii int-Ieasing pericentage of time ats herd size approachecs
thle capacity for at particuilar lagoon. theiehy caxising costs to
rise accordiingly.
- - I -Conventionol
= - Flush -Irrigation
..... = Flush-Logoon
= - Semi-Liquid Haul
no ce'cior -
?
w ih clerotor
Disking in Airazi .ie
Athead~ of C'orni Planiliir
Girciv Good VWeed Conitro/
GALE A. BUCHANAN and A. E. HILTBOLD
Deportment of Agronomy and Soils
ADIVANTAG.ES OF Pill-PL SNT Iterhicide application -loin
enjoyetd lby cottton fainer -tt are tnoxx itsvailalel to torn growx-
Crs. Atratzitie iiletrporatet its toothl as .3 wxeeks ahead tf' cornt
plantting gasve goodi xxe ectiairol ill Alaharria tests.
Possible redottioii of 55 (Ik load at planting time xxas re-
sponsibile for the initerest ill pt tplaltt hecrbic'ide alpplicatiotn tt
torin lan Id, atndc tltis ii lt(rest leto tot thle Auburn I project bte-
gitiiigii( inl 1967. Sottght inl the stuidy ilt the Platnt Birteeding
Unit, Tatllassee, wxere antswers to these specific qtlestious:
(1) Is wxeedl c'ontrol wxithI iltiaziine affected b~y eithecr sirl-
face or inicorported~O ap~pl ication ?
(2) Is ptersistenlce of attiazioc' ill soil cllaliIgetl bv these ap-
(:3) Is it possile to groxw soNybeanls bhindt torin the samte
yealr atrazit' is applied?
Atrazine xx as applietd at t ot ma
1  
( IX) and~t txxice i ormaIl
(2X) r ates alt fixve clattts begitlillit g itt janl~trx atnt extelltli(tg
to) corn planting time. In ole ser ies of field plots the herbi-
tide wvas left ulidisturllet oil tlte soil surface, swhile inl iltt-
other the hroadceast spray swas itncorporiatedl inimetfiatels 1)\
shl~lowx disking. Contrtol plots (no herbicitde) wvere tliskr 4I
to kill all xxeedls alt ])lanting. Soil satmplex xveire colletedtt
from tlte opper fexx incites iil eaclI plot during tlte gi-oxx it,,
season for detetrmining atrazine residue.
As showsn 1)x data its thle table, xxe o'c onltr ol xxas c(pi1tl
xxhIeth~er atrazitle xxas incor poralted ijito tltt sotil or lteft lil
the surface. Results wxere gootd ex en with atpplitatioot I
early as 3 wxeeks before plautittg. Inl some yeiars there \\xI
loss of xweed control xxitht Februarty apphic'atioits.
Shallowv incorporation did not change persistence o tf .
zine ini the soil fiom that observetd xxith surfaIce atpplic'atim
Soil content of tlte hetrbicide declinled ctit uionsly af tet ,I
plitatiolt to itnsigntificatnt lexvels by fall. 1Te loss rate( pil
peitred somewxhat slowxer in eatrly spring, its shoxn it y' thlt
graph, lprObl~)y hecause of loxx'er Soil tempe)ratures. A I I
I ate - olyx aboult 201 day s lontger.
Atrazine c'arry over is a problem in stch areas as tIll'
Nlidxx'est becaumse of cootler climate amtl soilx xwith less acjdi tx
lablel rextrittiolls stipula~te thtat fields treatt'tl xxitht atratzit It
ate ntot to lbe p~latedt xxith crops other ttait tcorn~ tuntil the
folloxxintg yeart.
Results at tile Gulf C.oast Sl)'ritatjotl fillc'ate tliet ei., fll
it olleitt from tatrryover of atril /tt x ltll soxlti111 tll am
snllaii grains are planted tile sac~t yeal following corni. Ati a-
joe was applied 1)roadcast at hlot ma] and~ 2X ia.tcx prierl-
'thece to emn illt Marctb each veal. After tot it xxas hai xested
I t ) silage il1 earlv *Jcd I te soil wxas pr epa red atl nid ~toec -
lxl planttedi to soybheansI. Ry e, wxheat, atnd( oats wxete planted
I ite October after soyb lean barveost.
1 tYeans planted oiily 4 moi ths after a 3-1lb. per acre
:jcation ot atrazii I to silage colil shIowed itt iCld rc-
I huttoll. The 4-N "ear axverage \\ as 17 ho. per acre, as cotil-
ptied xx ill 201 1)1. for plots gettinig titi ilet icide. 111(1 easinig
he atrazitte tate to 6 lb). per acre tilt N iCet to 15 bit. Smtall
af aits followinig thea sox heat s showxed ito effetcts ofl at ratilit'
i ("ritlO.
The experinIilts decscribed illuistrate' that atra/itte ,ait bte
applied either prtC
1
lanlt incorporlatetd or p) iinelgt' cc to
cortn, atnd xx itli Ito res'idue pt otlilt. Shallowx ittttttp
01 
ttitti
maxy be atdsatttageOoIS ill drtv xxether, serixitlg to tltsti lito'
the ati a/ittC ititt) moist Soil atnd ptrotect tile, cheical agaIiiist
degiratdatiot A 1 ~ScMIlifl It. Oit the th'lei Itatnd, deep'l ill ctt
poratioll tlulttes the atrazine anti is all alltt' expt't st'. Withl
faxvorale ie oistctre toll ditiotts, tlte stantdardl pric' eitrgt'itt
atppl ication is equtally elfetis C. Sittitt atI/zinIt is ittitct ixatetl
ill soil tltirinig tile growxxitng s('atoll lot c-ot tt. little it allyper
sists itito fill- fall iii motst Alabiamat soils.
Atie i n
rS 4. p p in
3-
2I
0
Feb 21 Mat 20
m i~
2.5-lb rote
Apr, 3 Apr 18 Moy 2 .June 13 July 15
Cil\ Xi o.I\,I ltolt Six \\ 1I I Ks \1- ii, Ai 1 tt1 \i \[.
APPI'i'i 1\ itSl 1) t DIII tillNI N1l 11ilt)' ANDI
Al DII' RONT DATEx~S, 1967u-69
Da~te- of,
aplicationt
I Siorhtcr'
Ittlirpi ii.tte
Ill Sill facc
It lcirportet'
Nio llricitti
No Sitr ici~ h
IN' Suiltci
V xi tirt ujtil
XX clls pt'r 8(1 'a ft. 
of row _
('ra'.xxls Itloadtictt xx itls
1967 1968 1969
No. No. Ac0.
271 :15 125
86 54 106
2.279 1:18 127
56 :39 12
21 19 142
2,019 156 :359
120 22 222
56 14 :39
1638 ti0l 419
128 48 1:3
2t 24 25
1,60t4 7-2 3 15
I1967 - 1968 1 969
No. Not. No.
Hitc xxix 2.5 11). pcI ten',.
Applictiont dtc b\ lix i . 1967 liitt tt 27, NMtti I 31
April :3, Apil 18. atttd Nlatx k 1969 -Feli itx 4, Ittrit t.tr 28,
NVttil 1-2. Marchl 27. liii April 9.
Narrow Row Golion SXiii Doitbiful 
for Alabama
NOELL K. ROGERS and WILEY C, JOHNSON, Department of Agronomy 
and Soils
IN io w 0 ii (oI-rN sh ows ',lit tlc likeli hood of revol utin-
i/illg AlaI iii ' coil11 (tto prio11d((uclt101 Neerithless, th erec arc
good ieasns for inter est inl this pronductioni s , ysciii.
In terest ini 'n arros row"X Or "l igf popul atioini- produc tionn
-aiX i~o\\ 5 idh inrrowser than tlie usual :36-42 in. wsith
phin popiiiation11 of' ablot 1 00,000 per acire - has 11ul1tiplied
iii recent vcais. I nci easing production costs and corresplond-
in g profit rediicti(Ii are major reasonis for the interest. The
iiexw system appears to offer somei relief to soaring productiot I
costs, xs itli fiv e specific adv antages claimed:
(1 Sligbt yield iueases, uip to :30%.
(2) FewXXer boll1s per plaiit o11~ii or plaits for mniiforin
early maturity and ioric olitom lint (1iialit.\
(:3) Earl oiice-oveCr lharsvest.
(4) Fewer ciisecticide aipplicationis necessary.
(.5) Remova] (If' food for rliapaiisiiig 1)011 we evils because
of early harv est aud plau t destruction.
Most in terest and research iii nan oxx rowx ss stemis has fietii
iii cottons groin lg are'as of the SouithwXest. Phlint blreederis in
Texas hav e delesCoped (icteriiate, early fruitiiig 
straii s
adlapted'( s peci ficall ' for Iigl popul atin l ii narr rows'.
Pi epl alt ledrbici de coi bin atioi s hiasve been dlevised for sea-
xioi-lIoi g wveed control, and hiarvesters hiave beeii devc'lopcd
or adaipted for niarrows rioXXs.
Couitiii in( cliff ciit iii Alabama, of coulrse, so thec
niarro (iXX \ r(iXX etho Ii0 h as b een stiudliedl at Anubur n iai d the
'lemiicssce Valles Sufstatioii. Related i eseircfl nii liars estilitg
is beiniig (1(11 i cooperativ ely swithi U~SDlA aid tf e Agricultuinal
Eiigiiieeriiig Research Unit, Marvvn.
No) consistent or large yield adsvantage has resulted 
from
narrowXX ross plantings at Aubcirn or the Tennessee V'alley
Siibstatin. Average total hunt y ielcds at Auburin wsere 
similar
fo 1i0t), 20)-, and 4t) mdi rosws (648, 678, and 665 11). 
per
alcre) . Vairieties irespondled differently to the three spacings,
hiow~ever, as shiosn bily the graph.
Varieties adaptedl for use in the area (Stoneville 
21:3,
Deltipiiie 16, Auhui i 56, andc H aiicock) y ielded 
liigf ti- at all
spowil i g thanii the txo IIssesteri i cottons.x Lockett 4789-A 
and
Pas master 1t)1-A. Stonesville 2 13 wsas the oiis svariety ssith
hlighi yields at llt tfsrec ross spacinigs.
Ytield cdiffereiices betweecn ross xwidths and v arieties wXere
small iii 1972 tests. ssithi iio response toI diflerciit nitrogen
ratces. Comparisons ss crc betweenci Stoniesille 21:3 an iCl(oker
8:30)4 (anl expeirimeiitail strii) at 21- anid 42-iiili rowX wxidIths.
As slinsX b\ (I ,taL ill theI tablec, Cokei 8:30)4 imade thei high est
syielcd ill iiarrOs ross s, buct difFei euces wvere smnall.
EFFEC T OF VAOLiN, liOss W~IDTH, AND) NIOG~EN RASTE ON SELn
Conii~oN Yicii, Ti -NNLssLE VALLiEYs ScixiATIOx\, 1972
Blow wvidth
andi 5 ariets'
21 mncl rows
Stoiix illk 213
Cokei 830)4
42-inch rows
Sto nes illh 2t3
Coker 8:30)4
Seed cotton, by N rate
80 lb). 120 lb). l6t) l).
3,458
:3,625
:3,550)
:3,570
LI).
:3,68:3
:3,706
:3.788
LI).
:3,422
4,0)37
Three iii trogeis rates (80), 12t0. aid I6 it) l. per~ acre)
wsecie tiried inl tfse 1972 va~rietv in 1(] rows wsidthi tests, lbut 111
" icld (li e 
ecs iresulfted'. 
Al tho1)ugh seveiral 
scars of teisti 
112
aire nlecessary to adequiatels' es aliate cirop iesfpiiise to iiitio
gen. results iii 1971 sod 1972 iiclicate thiat iialross rosw
cotton ii needs 11o mliore N thai tI e recomm ciende rate for
svide rowss.
Pirobllems unique to the firnnid Southeast compilicate pro-
ductioni (If narrows r-oss cotton in cntrast to swesterni parts
of the Cotton Belt wshere the system is being used success-
folly.
Weed control is one of these complicating factoirs, since
cultiv atin and lay by hierbicide treatmrrents are (difficuilt iii
narrowy rosy cotton. Fields infested ssithi suchi hard-to-conltrol
ss ecs as niitsedge an(1 inlnsongrass are not suited to thle
dIalrr055 rowS system.
Cotton in niarross ros showss drought stress sooner and
these effects aire more severe thian iil xx ide rosss. IEveii a
I ilrt drought dnirin g the shiort fruiitiiig, period of- iaoiiw11 rows'
cotton can cause serious yield loss or c eien a crop f)ailure.
Thle samne short cliy p)eriod~ iii cmix iitiinal colttoni wonuld
delayv frcuiting aid perhaps only slighitly reduce x ieids. Ex-
iissis e Imoisture and nitrogen prescilts 'thce sime 'problem 
of
1111k gross th regardless of ross wsiclti.
Harv sestingf inl nairrows lows r equires speciailizted machines.
Ordiiiary 1- or 2-ross picker s cainult he used. A spindle type
colttoin eomf iic lhis been desveloped but is inot yet geiieirally
as ailablc. Suitablle stripper harvesters also1 hiave been de-
(loped.
At present there is niot a cotton v ariety adapted to Alabama
eniiditious that wyas dIcs eloped specifically foir nlarrows rosy
prodi~uctin. Commnls used varieties have perfoimed het-
tei than the wsestern varieties vx'ien gross' in narrowv rowvs,
exvei thocigh they wsere not bred for this type culture. No
dfistinct advsantage frcim growsiing cotton in narrowy rowvs has
shiowved up iin the first 2 years of research.
insect pests. Chlorinated hydrocarbons,
organophosphates, and other products
of the great chemical insecticide boom
of the 1940's appeared to be the ultimate
wxeapotns for control of these pests. floxx -
ever, the enthusiasm generated ly cliemt-
ical insecticide technology soon subsided
ais problems of insect resistance, persist-
ence in the environment, danger to non-
target organisms, and hutman safety we re
realized. The search for safe alternatix es
to chemicals wvas continued.
One such alternative is the utilization
of disease-causing mnicro-organisms in in-
sects. Insects suffer from diseases just
as humans and animals. Viruses, fun pi
b~acteria, and many other groups of Or-
ganisms take their toll of insects under
natural conditions. Insect pathologists.
scientists wvho study diseases of' insects.
hiave discovered at nmbmer of mnicro-organii
isms that shioxx' promise as Microbial inl-
secticicles. Among these is the bac-
terium, IBacilb li~ hnngu nisiv, connnonix
called "B.T."
B.T. wxas first reported in 1901 as at
pathogen causing death in silk xvor ni
larxvae. It has since b~een isolated fromt
M
/
C-
S
FIG. 1. (top) A microscopic view of Bacil-
lus thuringiensis cells that have been mag-
nified 925 times. (bottom) Diagram of cell
components (v) immature vegative cell,' (m)
mature cell with spore and crystal, (c pro-
tein crystal, (s) reproductive spore.
6
Mid Use' oJ 'ia.icrobhiI Iilctwid'
JAMES D. HARPER, Department of Zootogy-Entomology
ROBERT T. GUDAUSKAS, Department of Botany and Microbiology
it inn I a'r of in sects in diflfercut parts of
the xxorld. Some strains have shioxxn
reater pathiogenicity or killing pow~er
th amin others. TIhe more po tentI of thIese
have been mass produced by several in-
dust rial firms for commnerci al sale aind
ajplicationl. Some Of the etd lx V
1 
ll-UCt5
tue t xx ith Ieit her limit ed su ccess5 or coli -
plete failure. lRcceitlx ', a inexv\ 13.1. strain
xxithi :30 to 501 times more killing poxxer
lt- cetin ini sect pe'sts Itas replaced older
,traints onl the market. This it(%x- sti ao is
('iiI eiltly produmced and mnaiket(,d in the
IUtited States a5s Iiotrol( \K , ic
anld Tltimiicide" an tmd stoxSs rc tiltrktble
ahilitx to conitrol mailx\ dithilt to-kill
pecsts. 'The bacterium is lotrmuilated as a
51isltisniot, xvet tale poxxdIer, or (lust,
11/I. is effective aglaitist xvariotis cittet -
plillars, many of wvhich ate( setrious dle-
foliators of vegetables, cotton, sovxbeans,
ornamentals, and trees. It has, little ef-
fect onl othier insects atnd thus is veryv
selectiv 
e iii its 
actinl. 
Most lueneficial 
ittI
sects, such ats pre'datorls aid par itsitcs, ate
no(t affected. lIi addition, 13.T. is notn-
toxic to min anor otheir xvertebatt tes aind is
exempt from tolerances established bxy
the Environmental Protection AgeneYx
Thtus, a crop can be treated, harvested,
and consumed or processed xwith no x\ ,tit-
ing period, xwhich is ptirtiuctiax' dcsir-
ildefor tihe home gYardener oi- x (getld)e
produncer.
3.1'. dlo's tnot iofcl .til kill iinsects ii)
the same mnat ter ats huminan baeteria. In-
stead, 
each bacterium 
producees 
a tiny'
prYoteint crystal, igu re 1 , xwhich u. it
itigestioii by a sos ceptile insect, breaks
(oII x l itnto at Clhenmical tat causes drast ic
chatnges it) tIc insect's stomach. On ce
cry stals are ingested, feeding ceases. The
isect lixves mintil it starves to (deathi or
unitil reproductiveI spores consumed xxithi
the cix stals germinate and infect the
othler tissues (If the bodyx
13.T. has been tested against a x to ietx'
(If itnsect pests onl sexveral crops in Alit-
llama. It suecessfdlv contrlled the comi-
pl ex of defol iatortis (It col lards, Figure re
itchltig cahbazge llopers, imported cab-
bagre xxorms, and cliiamold hack muoth
linrx ae. Onl sox'heans, it xwas effectix e
atriitst the velxvet bean ctaterpillar, green
clox'erxxorm, anld sovbean looper. Loop-
et s antd~ hornxvorms xwere controlled oil
totntitlll's, xxhile fruitxvotm controtl xxas
inad~eq fuatte. Loopers tttackin g cotton
ean he co(nlitrollled xx ith 13.T1. in tI e irtre
it st toces xx\-]teil such con troll is requ iredl.
Extemisix e testingr tiiinst the forest teilt
caiterillart inl xwatter tu p el o stiolds hats
slio\NnI this pest to be higahls susceptible
to 1I.T.
h3.T. is safe, iloli-residucal, andl sehec-
tix e. hav ing little effect onl non-target
otrttnisms. It thIs overcomes draxwbatcks
itlsoc(lttedl xwith nmnv chienhical insecti-
cides. ew tincd excin more poteint strtns
dl itI'ltlx 1 eiiig priodultcedl pronmise to
Til, ikt1.1'. c'e(iitll Illre uisc'fi il ii) fuitnir
ill ct litroll pro'ritils.
% 
V
FIG. 2. Four weekly appli-
cations of Bacillus thurin-
giensis protected the right-
hand plant from the damage
received by the plant on the
left.
Development of Structural
Sandwich Panels With Sawdust
Bark and Southern Pine Veneer
EVANGELOS BIBLIS and GEORGE E. COLEMAN, Department of Forestry
M ORE THAN A YEAR AGO the authors
reported the development of a structural
sandwich wood panel made of a particle-
board core (commercial underlayment
southern pine particleboard) and south-
ern pine veneer faces. It was stated that
such panels were tested and found to be
stronger and stiffer in flexure than con-
ventional floor systems. It also was stated
that conservative estimates indicated
manufacturing costs of such sandwich
floor panels could be 30% less than cor-
responding costs of commonly used floor
systems.
Now, we would like to report the de-
velopment of an even more challenging
structural sandwich panel, which con-
sists of a pressboard core made either en-
tirely or largely of southern pine saw-
dust or bark and faced with southern
pine veneer.
It is known that the amount of saw-
dust derived from manufacturing south-
ern pine timber represents between 8
and 25% of the sawlog's volume. It also
is known that the amount of southern
pine bark of pulpwood size trees repre-
sents between 12 and 24% of a tree's
volume.
Although bark and sawdust have been
used for several agricultural products,
the majority of bark and sawdust either
has been burned or accumulated in large
piles. However, burning bark and saw-
dust are prohibited by State and Federal
anti-pollution laws.
Other studies concerned with utiliza-
tion of bark and sawdust in board panels
indicated a severe reduction of strength
properties with an increase in bark per-
centage. Inclusion of 20-25% bark in
wood particleboard reduced the board's
properties below commercial standards.
What was not realized was the potential
of using board containing large percent-
ages of bark or sawdust as cores of sand-
wich panels with softwood veneer faces.
Preliminary Experimental Results
A limited number of experimental
sandwich panels was fabricated, and
specimens were tested in flexure to ob-
tain preliminary experimental results.
Two series of pressboard mixes were
prepared, one with various portions of
southern pine sawdust and the other
with various portions of southern pine
bark. Each batch was mixed with urea
formaldehyde resin (9% solids) and
pressed into %-in. boards. One-half of
each board of every mixture was ma-
chined into 3 or 4 flexure specimens, 3
in. wide and 19 in. long. The other one-
half was laminated into a sandwich with
/s-in, southern pine veneer faces, then
cut into 3 or 4 flexure specimens.
All specimens were tested to failure in
flexure. The table presents properties of
the two sandwich specimens with various
percentages of sawdust or bark in the
core. It also shows properties of the
ordinary two-layer floor and of %-in.
southern pine plywood, which is used
as a single-layer floor over 16-in. spans.
Summary and Conclusions
Limited experimental evidence sug-
gests the following:
(1) Southern pine sawdust and south-
ern pine bark can-be utilized successfully
to produce pressboards to form the cores
of structural sandwich panels with south-
ern pine veneer faces.
(2) Such structural sandwich wood
panels appear to be structurally superior
to the two-layer conventional system and
undoubtedly could be manufactured at a
fractional cost of the two-layer floor. Re-
sults indicate that such sandwich panels,
even with cores containing 100% pine
sawdust, are 185% stiffer and 140%
stronger than the two-layer floors.
(3) Development, manufacture, and
utilization of such structural sandwich
panels would provide the following bene-
fits to the forest owners, forest products
manufacturers, consumers, and the pub-
lic:
(a) It would provide the opportunity
to make full and efficient utilization of
all wood material and thereby contribute
to the conservation of our natural re-
sources.
(b) It would produce a structural
wood panel at considerably lower cost
and with higher performance than the
two-layer conventional floor.
(c) It would contribute directly to
the improvement of the environment
since it would eliminate burning and
disposal of these residues on the land.
FLEXURAL PROPERTIES OF SANDWICH SPECIMEN'
Density, Maximum Load causing Internal
Specimen
2  
lb./cu. ft. load, lb. 0. -in.mi bond PSI
s-o 
..------------------------ 
47.1 
1,196 
323 
240
s-15--------------- 48.8 1,024 306 
238
s-30...--- ------------- 43.8 982 282 154
s-45-- 47.2 1,050 277 
237
s-60 47.6 973 260 203
s-75 . . . 47.4 919 
258 194
s-90_ -- 47.1 971 293 228
s-100 - - 47.0 911 259
Bark sandwich
b-15............... 47.8 893 252 
188
b-30------------------------- 47.7 966 244 118
b-45...........------------------ 48.2 917 253 
120
b-60 ------------------- 47.9 781 228 
76
b-75 ----------------------- 47.9 709 263 
71
b-90................ 47.8 587 252 
63
b-100 ------------------- 47.8 553 237
Two-layer floor -------- 377 90
% in. S.P. plywood ......-.. 445 82
' Each value is the average of 3 or 4 specimens, which were 3 in. wide and tested 
over
a 16-in. span along the veneer grain. For comparison (a) properties of 
the conventional
two-layer floor and (b) properties of %-in. plywood are listed.
2 Numbers after letters s and b designate percentages of sawdust and bark by weight,
respectively, in the core of sandwiches; s-o is a sandwich with all wood particleboard core.
7
BIGGER FARM INVESTMENTS 
and HIGHER COSTS
JH. YEAGER, Deipartment of Agricultural Economics and Rural Sociology
T . F1,1E~ iI YNs (x kXcIiL. Tbis is onle of the 
muost
si gliific(alt f eatuires l 1(11i Iax giiilt 
.
Tremend2 (oils scic I ific aldx iincesi h it\-( be 
n radic ill thel
produlction of cropsX, live~stock, anid 
liv estock p rodul ct s iii t 11
past qularter ((111111Y A Ilajol 
itx of tlei c aduacex (all lie
adoptedI bY prniiiw r o il] , N tiloigh 
additinlill olntlax x of
ho lx ill tibe Joilt of calpital mx c ti 
cii t or oI peration cx-
)cii es. Thiis does lot nimply tI at it is 
not profit abIle for pro-
dulcers to atdlpt andl use dex elopinets of this 
scienitific age.
To tile (01itriulox. \\-here sounii niallageirent 
bas been used
the adopltioni 4I scienice and tecliilolog\, hals 
liliilix diidellds,
to produlllcers. It hals alsol greaLtix blleiftcd 
colisulnlel X alit
societ\ xi0 geneiral. Ili no other ill 
(llstrx din rill g th( Past
quiai tii ciitiirx lavx c insli ill efficienex 
oif' prodlictioli been
"F geat its ill .1 ricilti ure.
Increased Size and Capital
Alabamani fillihaxve growxii inl sIie front 
anl axverage of
abomut 10t0( acres iii 9.5 U to imore thii 
200t acres at pr 'eent
Tis i tien inlt ii reas, sizXe wxill (01 t 
ii 0. W\ithi 10 (c izi
tioii of' ailmos)t all operaitionsi, fairrners c-alli alit
1 
illust hallidl
ficieiic 1C , tihe fatlle 1\\ ill finld that is liit 
closts ioi produtictioni
Thle adiiitioii (If acti(re~i toi exixti iig filiii 11i 
its am
1
)( tile
llliililli of, iariiis liax e gixel iis e tol 
all fiiicrealse1 de-
iaid for fain hol ad. Ali ig xxith other 
pressuires toI acquIire(
hold( for 11il aioiln01a grieni tiri uses, Suc citsa 
recrelit ilal purl
poises', ouiii ex siopn ,1 t coiiintry estates, 
airiports, itiid pipe-
Ifitis thiicily IXIIagi iii of Ailbama farlil 
ival estiti- ftll 1121 C
ils 111111( thui doubiiledi iii tile pas~t 8 
x clrs, is shiIi bloiiX
ow , i 10' ill/lXii iiig r(ii
o)
It I 1
I :)
inl 1972. Tiiiee-fiiiiitlis of thlis toia \\iax iii 
iai estilt(,.
IThe 197:3 itciiiii \x zod eipmelli'i 
iixistinlit wxiii ie
gireaiter than11 ill 1 92 I (illca of x 1illrilsed 
pillrciiases of filarll
tr actors and( oitiher m-iadichiex miid eli ip111eiit 
itemns. Saiies
of triactiors ill the 10 t ho nrsepixxer anti 
larg-er icreased1 1 ioe
ill 1 972 tia itsles for smalier sizes, 
acclrii i tol V SiA.
Salfctx , iv imd anitipoilhlit ion re gi iatin 
fill o 1 a110 ffct ill ii) rs' ill-
xistiiiciits iiill icliilerv alid efiipiiit. As 
lii examle, ie
allsin fcireaseid. I iiyliel pr1ices fill iattli tol('etili' 
xxitii greater
iitiillh('l pofiliit tii .1 gi eatcr totlii ilix cxtineiiit 
ill lixvestock. For
tihe U.S. lix cri ~gi, iix istiitk i (2s inl 1972 XXiII 
iiiiiit 18%
aillx n the 1971 iexvei. Lix estock prices tloliilid 
illti 197:3
lit elititix cix high lc els.
Greater Expenditures
prexviish] .v, ut alsoii ~isiileriilx 
more cac~pitli iii thie loiiiii
i.f iipci 
1
tiig expeises to III ii. Ii I 972, Alaba 
ani ainis
spicit moore tHiitt tiiree tiimes axs iiix 'v dllars 
liii prodti on il
iteills as tilex didt n 195t0. 1hix inicrease' 
resultedI 111111
feed aiit liveistock and1( initerest 111 tile 
fali m0lortgage debt
xweire items xxitih the gr eatest expen litni e fi creascx 
f roin 19501
tio 19712 ics \1(iiiXXi here:
Fi ltji/ r id i
lpi ' it( ols
I itI list till 111111t",ait dhiebt
ii 45.3
S.:i1- 7.7
5Pt 0i 1 6i
28.3
15 r cclt
707
i9.30
151
252
67T
57
Iii Iil Beal Fii i ,:, Ni i ii I il lipoi,tsX vi liii 
i- s2 iii
the fioll \\(1XXli i. lidif to li-tilt orll 
ci fiii1111 ill otfiti
I ealslls. Tll thie o1112 XXo i xisiics tol 
gio inito agicltuli p-
tilictioll, hoxxevxer, acqiuisitioni of the 
1re11 estate resourlice
preseints aI imajor proible-I. Ailso, i 
pii t raiisfel of it higil
aihie estate ait deail of' the iixn11r, tax 
iiibilitx and othe1r
1p1riibleiims niax 1 Ic ce coiiiiiteled. Becaiuisx 
of the trernicii doiis
celi est ate cin ill il ix stioll it 101re ti, 1le1siiig 
or oither il1-
I ritilemlits foi obitaininlg thc tise of' 
farm1 reai cM staltI hie
and~ xxili continu~e to hc rnorc prex 
alciit.
Besitics real estate, xxhiich represcils 
linid(, bii niigs, mid1(
otheiir pcin11111elt ll(imro 10121 its, a 
faiii er's cap1i till ill (5tin ci it
foit eii used inl pioifictjoi i, iiitci est, tax~es, 
and1( XXlgn- IlitI's
inlcreaisetd 72% front 195t0 to 1972. FarmI 
mit-iiiierx , iiitiir
ehicles. iliterest, 111(] huiltlig and1( fencinig 
intcerials xwere
ill(iMhix illi itemos slioxx hg illiljor Iiic]relIsteX 
ill prifees during
tis iperiodi. Tiic outtloolk is for coitiii-n 
cost in creases for
inolst prolductionl itemis, iiicludiiiii fertiffizer xxiiich 
had1( a 10111
tix eix, siliali coist inicrease from I 95t0 to 197-2.
Ill 195t0, Alabarna faimers spoilt 66c( oit 
of' ea~ch $I ill
tash rcceipts fromt far-m roirketfn gs for pro
1 
ictioi i iteils. Ill
1972, prodctionlti itelils toolk 81ic out of each 
.
L E NEIS AiRi lTHi MiOST IMPtORiTANT pairts of corn p)hitts iii
food mnanifactutie. Although they make up mnly I 1015% of
the wxeight of allove groliid Plant parts, tile leaf biladles mnannu
facturiie most foo produc0(0 ed byi tile plaoit. Otiil it simIall pot-
tion is produlicedl iii husks, stalks, leaf sheaths, anid tassels.
Th pobe inl efficienit piroducetioni of cornl gri m is to
have eiiigh leaf area lot maximutm yil ye ot etiotigl
to make the plant excessixvely vegetatix e at the expense of
gaini. Iiistiflicieiit leaf atrea results inl poor use of light sitice
no teIll of thle soili l it reac ics thei grou I ( at ci is lost to the
platts food making~ process. With toil manix leavePs, how-
ever, there i .s excessiNve slhadling of' loxxer leaxves to reduce
their effliciincy inl food miiatnufactuire or caiuse thi cm to (lie.
13 citiitt isI iip liet NN cii opitimutm leaf ate a atii griiin yi eldl
wa ,s estalishied in l Mf i 72 r esearcli wxith thitee lix NLids ( ir
ri gatedl) at TI ot sl N. Leaf le gfth It ittd x id(th Iixxete moeasuiiredl
oti live leaNves inl ttiid-IitlN ati the leaf area indeix ( LAI ) cal-
culated byN mtltiplN iig lcigtli x wxidthi x (0.75.
A ii LAi - I mnean s theirte tire eniiigi gIlaf bl ades onl I acre
of coiti th iat if platicd flat oti thle gt ottid ott d exactlx "lNiecedl
together NN 0111( just cox er the acre of girountd, Figure 1. Like-
xwise, ti cro wl) ith at1 iilex itf :3 wouldt c exact ly covet ani actre
xx itli 1111c (d ix c ofIt x
FIG. t. Illustration of leaf area index (LAI)
eld, ba /0 re
10 
FIG. 
2
140
Yield, bu/acre
160
rFIG 3
150
Calculated
1969-70
1 2 3 4
LAI -totl
5 
6 
7 
1
I 20
110-
k- Calculated
1969-70
100-
0 .5 1.0 1.5 2.0 2.5
LA! 4 to 6 ft. above soil
LAI-2
LAiII
lo Much1 Leali Area for a Good Corn Crop?
C. E. SCARSBROOK, Deportment of Agronomy and Soils
B. D. DOSS, Coop. USDA, ARS
LAIl's lix 2-ft. x ,erticaii sectiotirs hegititiig at (hclie 
ounttd~,
wxe tietistretl to (letetimit, itxxlilli leaxves i thle ilatilt wxere
miiost cilsely tel ated toi grin ixie Id. A tan ige (of' leaf' arpeas
xxas obi tiiull crb1i N tirvNitg 
1
ilaitt poplatiois itt troxw xxidtlis.
Amounts oif N, P, anid K fertilizers cotisitletei adequate for
toiitmim yields xxere uisedl.
Data for I 969-7(1 xxetc used to calcitlate axverage relation-
ships hctxxet total L AI atid gi aiti yield for- txxo lix h rids.
The graph of this reltitiot ship, Figure 2, predlictedl that
x ~ieids xxoul btrle highest xx liti the totil LAI 
x\vas abonut 4t0
toi 5.0). Shiatp redoctiotis iti y ield could lie expcteI xxith
h igh et ot liowxer in (lex xatiues.
YIielrds from I mneditti height, ir-seasii iyiv d ind a
tall, tuill-seaxoi i I rirI xxere bioth tmutchi hiighiet itt 1971-72
thl iwxith lyix ds risen iti the Pt evijols 2 xears. Howexxvxer,
matximum Nyields its wvell as loxvercl xyields xxere font ( at
tibout tile stime LAI x aiues as prex iously obsetNven.
Leax es located 4 to (6 ft. ablov e the soil xxe(re tmore aic
cturate thi ti othiier plant segro en ts iii ptedIittng gi aiiti yie
1
ld
itt 1969-70. Iii factt, trlintdtpex biaseil ott thiese leaN es pr--
(Iiet ed nit imatte gt titi y(ild as accutrately as, totalt LAI1. Tili
calculatedI relatiotishiip piredicted tuaxitliutl N ieids xx leu tile
leaN cx of tile 4- to 6-ft . segirietit had at i LAI of' 1.25 to 1.75,
Figutre 3. Yield (lttN es for the (xxi) lwxbrinis slioxxed a
sitmilar relation ship inl 197 1-72 at i 19 69-1)0, although griit
yields xwere I i(i ci tie latter N eii.
Accutat ot (f index x alutes iii x ieid pm edictiilis is 5liiNN V by
the Ttom sll trexults. Both total LAI aiidl LAI (If' tilie 4- to
6 -ft. sggtoit p~redictedl LI)Oltt txxo-tihirdx of' lie x atiatioti itt
gIi i x ielns xx here tmoistuire wvts alxxax s adequtiet. The cx-
tless leaf ar-ea foutid aissociated wxithi a i edltctioi iii graitn
"vieldl presetnts 
a challenige 
for research, 
KitIiilg hoixx 
tii
uti lizc (lie food -tnaki ii g potetiiti al o f ti s excess leaf' tatea itl
11Hybrid 
A
\1971-72
j Hybrid 
8
\1971-72
Hybrid A
1971-72
120
110
1iooj;
0
,,Hybrid E3
\ 971-72
SO'YBEANS RESTRICTED hv
ISOIL COMPACTION
1
HOWARD T. ROGERS ond D. L. THURLOW
Deportment of Agronomy and Soils
W xx S TO Oil xi's more efficienat use of
soil moisture b\ soybean plants dluiing
tIhe ciritic'al pod-filling period x \-tl rino
fall is usuallx poorly distributed for top
5 ieldl inl Alahaina and much (If tilL
S'outheastern tliited States hiase c-oil-
cerncd scientists for x ears.
For some 3t0 cears, crop anu so151il scic ii-
lis ts, eni neers, I armn eqipin t mai i
fact iirers, and s(1 omie farmers hiax'e oh)
xcix ed and stuidied soil compaction. iii-
cllnliiig( "traffic.' paills. "hlaiu palls oi
1
osx pans. il e pan aire kuiioxs to
pi("v lit root peiletratiol Llid prioliferal
tiioi iii the sublso~il, and to cause root
sti aiglatiolill iiunaii soils wxithL loss
1o11 Ios to ,itidl dIexehpincuit of these
paills. Either tii' proposals hase 11(1
urxved pract icali or moLst fal n rs h axc
not0 1ee eci(OiLxiii cci that soil 'oimpacirtionIi
is it majfoir prolemii.
''l u trend to hicas ier tractoirs, along
55ith moriie "tirnes over'" for feIrtilizei' al-
plii'atioin, seedbe'd piepaii Ltiui i. planltinig
pest icided applicadtions ai 5 Lnd
1  
('lt ixatiiiL
hase 1' er to ili c soil coliatioLil.
Measuring Effects of Subsoil Compaction
Research xwas coniducted to dietermiii uc
tile- effect of x'anxiiig degrees of subsoil
(oim)pactio n i X ohvean growxthi and seed
5 ils. Pla~n ts \\erie grioxsn ti 55gal.
(irurms xxith ends removed. Ti use we rc
pila'ed ill trche is inl a soybean field aiind
filled wsith Laikeland lom\ lO isaniid, a
co)Lrse-textured so~il, and WVi irk~n filue,
SiiubsuifaLced hiaril
1
Liis wx'e f ormedl h~s
tamrping the subsoil to valrying diensities
fro tiloliose to compaclt. Seed ss cie plinted
ill S inl. of loose Soil oil top oIt the o illl
paictcel laver. Thel( 3-year studs \\xias
stairted in 1968. \x Llich xxas anl extLemels
lrvseasi5on Lit Atibuirii xx itli olxj tt.44 iii.
(If rainifaill from Auigust 1.5 to September
15. Ahouit 3 iii. of rainfllh occu'irred diur-
Pairtial Support for initiaitioni of this stiiihx
wvas prid rer by the Aimeiicain Sioy1beanAs
sociaition Reseairch loun(laitioii
10
FIG. 1. Moisture stress on soybeans, r ight
side, caused by subsoil compaction t300
p.s.i.) on Lakeland sand tabove) and Wick-
horn very fine sandy loom (below). Rainfall
from August 15 to September 15 was 0.44
in. (Photographed September 12, 19681.
ii ig this ciritical fruitiiig perid inl I969J
iiid 197tt.
Compoction Effects-A Dry Year
Ili OtiS xuiiilsI wsere comiipascted( to
I iinsities i aiwiui hetwxeei 
150t aind 9tt0
IlL, per sq. iii. ( psi. ) its meaisured 1)X i
p0 'ietroilueii r (Li poii iteti steel probeLi).
Plittits %\sr w'( xiltedi sd's Ir('I by Septeinl
I o' 12 oil bothL siuls wxith c'ompacted sub-
so~ils, Figuie 1. Esvei though 1.6 in. (If
rain tell onl September 17T and 18, the
planits nexer recoxvered Lnd y ieldhs we're
Redhicd driasticailly 115 aLi derees of
ciomp~jaction,. tiguie 2.
Compaction Effects-Normal Rainfall Years
Ill 1969 ai nd 1971) i Isusil cOilllpict ii l
\%ias redulcedl, and ranged betsxeii 75)
150 ). u i. esjs;titnce. ied \%eLxxre
reduced oin the hlamy) san d to abIou~t
50% of the non-compacted soil. Althoughi
sos beanis on the very fine sandy loam,
whiich has more water-holding capacity
than the loamy sand, suffered less with
light subsoil compaction, vields were
reduced 60% at the 450 psi. resistance.
The non-compacted soils produced yields
eqjuivalent to 57 and 76 hu. per acre on
the Lakeland and WVickham soils, re-
spectively, in 1969-70.
To exvaluate these results, information
was needed on the compacting effects
of traffic, such as tractor wheels. Hien-
dricks and Dumas, Department of Agri.
cul tu ral Lii ginecci u repor ted inl igh-
ligi ts of Ag' iculttiral Besearch, 
Vol. 16,
No. 1, Spring 1969, that sandy loam
tori ied 12-14 in. de(ep each x'car wxas
quickhs recompacted inl a traffic furrow
iia iIt oton field to at pene tromer re-i i
sistiice of oxver 600 psi. at 21' 2inl. dleep.
The( samne soil, wxhlen turned dleep the
first xNear ai d tl io harroxwed each y ear
be)fore( planting. \\-ias i ecom pacte to
moie than 400 psi. strength at 8-It0 in.
decep i) :3 sears.
1T1is research shiows the Serious ef-
fects o)1 soil compaction on sos beiis. If
the' sos bean planit is to piroduce top
Yijeldls the( niost practical 
kinown tillilge
in et Ions to re ducLe si l comipa ct ioni by
I eax x equiipmn t inust 1be foil oxwed. Un-
tl I Le nd iii r o praictical till age in eth-
od iid sx stemns arc dexvelopled, the soy -
bIm ItLLIrosser should cnsider: ( 1 ) deeper
pleosiiig, (2) operaLting tractor wxith
xwhleels onl unplowed land, irather than
in furr ow, xxhen tuiiiing the soil, (3)
limuit inig wxheel traffic to certain id dles
after plaiiting, and (4) making fexwer
trips ox ci the field.
I Penon i m tr resIitance (psi )
FIG. 2. Effect of subsoil compaction as shown
by penetrometer resistance on bean and
straw yields taverage of 2 soils), 1968.
4
F_;WW 
K-
THE PEANUT PLANT is subject to at-
tack by a number of plant parasitic
nematodes which directly, or indirectly
through association with other soil-borne
pathogens, cause significant yield losses
every year. Root-knot, sting, and leison
nematodes are among those parasitic to
peanuts. Although various species of
these nematodes are present in Alabama,
root-knot nematode is the most prevalent
in the peanut growing counties; it is
probably responsible for the largest share
of peanut yield losses to nematodes. Be-
cause knowledge was lacking on the
value of commercial nematicides for con-
trolling peanut root-knot nematode un-
der Alabama conditions, research was
initiated in 1971 at the Wiregrass Sub-
station in Headland, Alabama, and vicin-
ity to gain the necessary information.
Research efforts have been directed to
screen different materials and formula-
tions for effectiveness against root-knot
nematode, to determine optimal applica-
tion time for nematicides, and to assess
the importance of root-knot nematode in-
teractions with soil-borne fungal patho-
gens. Results presented here will illus-
trate the type of information obtained in
these studies.
Application of Nematicides
Peanut fields in rotation with corn con-
tain low numbers of root-knot nematode
larvae at planting time; large proportions
of the nematodes are probably in the
egg stage. Application of a nematicide
at that time may result in less control
than at blooming time, Table 1, when a
larger proportion of the nematode popu-
lation is composed of the more suscepti-
ble larvae. Because of the relatively
shallow root system of the peanut plant,
it is possible to apply granular nemati-
cides that have some solubility in water.
Application at blooming time in a moist
year provides better control than plant-
ing-time applications. Such practice
would be valueless under dry conditions
when the material remains on the sur-
TABLE 1. EFFECT OF PLANTING AND BLOOM-
ING TIME APPLICATIONS OF A GRANULAR
AND YIELD IN FLORUNNER PEANUTS
IN 1971
Rate Time of knot* Yield
0
Treatment a applia- larvae / per
acre soil
Lb. No. Lb.
Mocap 10G 3 Planting 70 3,781
Mocap 10G 3 Blooming 3 3,889
Control 226 3,092
*Averages from four 4-row x 50-ft. plots;
larvae counts are midseason values.
Fvaluation of Commercial
Nematicides For Control of
Parasitic Nematodes in Peanuts
R. RODRIGUEZ KABANA, P. A. BACKMAN, and PEGGY S. KING
Department of Botany and Microbiology
face of the soil and is lost through vola-
tilization.
Comparison of Nematicides
Comparisons between granular and
liquid formulations of the nematicides
Nemacur and Dasanit, Table 2, indicate
TABLE 2. YIELD RESPONSE OF FLORIGIANT
PEANUTS TO APPLICATIONS OF GRANULAR
(G) AND LIQUID (L) FORMULATIONS OF
Two NEMATICIDES IN A 1972 TEST
Rate
Treatment 
active Type 
of Yield*
mat. / application per acre
acre
Lb. Lb.
Nemacur 15G 4 Broadcast 2,018
Nemacur 15G 2 18-in. band 1,689
Nemacur 3L 2 18-in. band 1,666
Dasanit 15G 3 18-in. band 1,779
Dasanit 6L 3 18-in. band 1,622
Control 1,340
* Average of four 2-row x 600-ft. plots.
generally that broadcast treatments re-
sult in higher peanut yields than banded
treatments at equivalent per area rates.
Results also show that use of liquid for-
mulations resulted in yield responses
comparable to those obtained with granu-
lar formulations. This suggests the possi-
bility of applying compatible formula-
tions of nematicides and herbicides prior
to planting and avoiding the need for
additional operations.
Addition of Fungicides
Adequate control of root-knot nema-
todes does not always result in propor-
tional yield increases, probably because
of the presence of other pathogens. Table
3 illustrates the need for including a
fungicide (PCNB) to control "white
mold" (Sclerotium rolfsii) in fields where
TABLE 3. EFFECTS OF Two NEMATICIDES
AND A NEMATICIDE-FUNGICIDE COMBINATION
ON YIELDS AND ON INCIDENCE OF ROOT-
KNOT NEMATODE AND WHITE MOLD
IN FLORUNNER PEANUTS IN 1972
Nema- Root-
ticide 
knot 
e Yield*rate larv WhiteYield*
Treatment(active larvae/ mold per
mat. pint 
acre
acre) 
soil
Lb. No. Lb.
Mocap 10G"
0  
3 97 8.13 3,015
Mocap 10G"
0
? PCNB 3 
51 2.63 3,264
Fumazone / gal. 17 6.38 3,095
Control 171 5.38 2,720
* Averages from eight 4-row x 80-ft. plots,
root-knot counts are midseason levels and
white mold figures are the number of pea-
nut crowns killed per plot.
** Applied at blooming time.
it is endemic with root-knot nematode.
The involvement of white mold or other
soil-borne pathogens with root-knot or
other nematodes is probably a general
rule in peanut fields. Because of the
importance of these complexes, our pres-
ent research involves a greater effort to
determine the economic value of these
interactions and the means to reduce cor-
responding losses in quality and quan-
tity.
11
SAFETY CABS SAVE
LIVES in TRACTOR
OVERTUR NS
ELMO RENOLL
Department of Agricultural Engineering
ARNG i is a cliigeros oceipation. 
Nearly 2,300 per-
so1ls ae killed allnuall and everic 50 seconds a farm resident
OF XWo1kfer in this country is injlllred ill farm-work accidents.
About oiie-third of these accidents 
or nmore than two per
(day ilVolves ftiin tractor.
TIIhe followillng table lists tractor 
accidents Iby thle pelrceiit-
age that etch tVpe ' occurs.
T .pcs of Iractor acOcidets
Tractor upsct
Fall from tractor ---------------
Crushed 
Ihiin oxer
Motor-\ chicic co()llsin I
Aiower takei-offll
()tiit-r
Per cent
55
15
10
At least txwo things can be doie to help reduce tractor
accients and the resulting fatal injuries. One way to reduce
all tY pe accidents is to give each tractor operator safety train-
ig. lHopefull' this will eitiable hi to operate the tractor
in at safe mainner and help him recognize potentially dan-
gerous situations before they become serious problems.
From the table it is evident that tractor upset or over-
turning is the most frequent type of accident. A protective
cab or frame and safety bIelts could be used to lower the
rate of occurrence of this type accident.
The cabls and frames provide a protective zone aroundl
the operator in the event of a tractor ulpset. They also tentld
to prevent the tractor fr-om turniiing completely ulside dlown
iy limiting tihe overturii to 90 degrees. See Figures I and 2.
The imIportance of the frame or c'ab in redcing deaths
fromn tractor upsets is evident from several recent research
N~
FIG. 1. Illustrates what can happen to a tractor driver, who fails
to have a safety frame on his vehicle. The frame helps to prevent
a complete tractor overturn and reduces the chance of injury to
the driver.
12
. z 
. ,,<,96
.4 A
1 
I. ' '
FIG. 2. Operator protection is available 
as standard equipment
on most current tractors as a safety cab (left) or a 
protective
frame (right) and can be purchased as separate items 
for mount-
ing on older tractors.
studies. O(Je slch stlvd \%-ias conducted for 6 
eCars ill Ne-
braska. A stunning 40%' of these tractor 
upIsets resulted ill
death. In addition, 53% producedc 
seriouls iijuirY. All of (ithe
injuries and deaths weCre om "op"11 tractors, with Iio all s
or frames.
In this same study about 5% of the accidents 
involved
tractols equipped with overturn protection. 
Altlhoough they
made up only a small 
part of the study, these 
accidents pro-
duced no fatalities, and 11o injuries ill half 
of them.
Some European countries have a long hlistory 
of tractor
cab and frame use. Sweden, for example, 
has more thall 50%
of the farm tractors equipped with 
protective cabs or frames.
For several xears they studied every tractor-upset 
accident
in detail. During this time :35 upset accidents wxith 
frame
or calb-equipped tractors 
were inxestigated. OMly 
one opei-
ator was killed - lie tried 
to jump aindx was fatally 
iiijured
outside the tractor cab. Not one person was 
killed who re-
mnained inside the protective frame or 
cab.
Informatilon from the Nebraska 
atid Swedeii reports sig-
gests that protective cabs or framnes aid safety belts will
greatl s relduce the chaiices of beiii g killed if you sihould
become involved in a tractor upset. \\Without cab or frame
protection, your chances of being killed if yourl tractor over-
turns arl-e as high as 40)%.
Not all cabs are safety or protective cabs; 
somle arle com-
fort cabs. Protectix e cahls are specificall designed 
for that
purpose. The American Society of Agricultural Eingin eers
ald the Society of Automotive Engineers 
Ihave suggested
standards for protective cabs.
Safety (als aid f rames cost mio Yt it t aits such li are 
sotit'-
tilmes tthought of as Ipay-extra 
items. The v are reall I 
payoll
items - it payoff in reduced risks of a fatal 
tractor accidellt.
Atb
-c-",e,
"C~ra9~~~
~ t~-*- -r -~.
4h
I I N v\ tLIt (;Ei's 'I'o 1) ' loii xeecls. At Iceaxt if sei'CIis tha~t
Tis oblterix 111 le'adsx to tit', assumpl~tion~ that XX i'id seed(
gelmiatiol of ceitaiti w ecix gix lugf tliiill a competitiv e ad-
Sattagre over cropslJ).
To proXvide a I .itige oit siiil tmoistnr vii aliues itle i til
seeds ci itititli xeiiis uiii aotr eprt
St1clitt 5cl b(n1 ilicI IrlTh XX a eect X tiX c b\ (r e lt ieia
sedtoi l Xfiler pltr 0, :3, (t, aid w( itx ]llltox ann ei'aIi " i pllt
XXco ('1 oltlitlia Th4 iiltd drough~i~ti \lles a w 711 il
0ihrotl ct tict XXssll c ccl XjCjto arii'ci X icltei ii ge t.( soniii
Ibir It'll
1
) it coXXlldiptiex as ilited ext: rph. 1
0
3
Per cei
germinc
so
- 60
40
pearlmil20
20
too- _____
80- crotoloria
60- 
*6
40
20-
0-I
24 48 72 96
Hours
nit
ition
0
3
24 48 72 96
prickly sudo
0
3
24 48 72 96
hemp sesbonia
0
7-
20 
.
766
0
24 48 72 96
Hours
Effect of simulated drought on seed germination of six plant
species is illustrated by the graphs. Numbers at ends of lines
identify drought treatments, from 0 (wet) to 10 (dry) bars of
osmotic pressure.
W~eed Seed Germ 
ili'ale,
en~ in Dry Soil
C. S. HOVEI.ANO and G. A. BUCHANAN
Depatment of Ayronomy anid Soils
Good - ttriiitggfltax , I) I ick Iv xici, sic'k Icpoc, atic td re
\teditun -ilX sho ' \ iotaliia It l'(XX tiitgi 115, :11itt vX ei t.
Poor -ci iriv dclitk, ucia(etii, i bitter xti ee ,\cxxed, anid inii
V I- ,- poor - lix iteanx and~ htettp xestiia.
thiii othter speciesx, xxitth 401'/( oft seedc gel'niliatilig at ei- 2-1
11Ii 12 Il cti In iest x e cixx1(2'xti (1il bax ) t tleix i II 
(121. lal
Soixtiaii seedI proIX iclec a xttritng cmnti axl, bc'iii X (T\N selli-
.1 3 iifit aild ti] att 6 ori itt bats otsttottie pressure ,' XXhile
P~ri c'k -v sicla, sicklIepoct. an ti o12liiiggori wer he ill l'l sI.t
titiiralit XXeccc spcciesx tot pool.~ moistiure' CI tcitiitis. 
Their
( *tzai i nd cr111 i iXXtititg lx X 12'I't' Xlit'XX at less tolieralit
Ittccdc even n'1 i 111 .
I littip seslbaiixi wxax the leixt tIiel'alit itt cdi'oigitt tr'eatmtsi'ix
imiiii to2 soX itlalix. Gt'iiitatiiit ot' tis Xweedc xxas XiiarI)X
twliicI'c at .3 b1ur1s, Xwhilt' ii 2% gt'iiatc'c at 6 liars a1111
11Ic at'X I0 bars pr~Iv 'tCuttr111]X 'ly deottck, danidelXiotx, miX itteri'X
XX lii I'ai Italiati t ' grasx shiowe121 littile effect. At til cierl
tiililtioli and XXiit'at wxas cirastic'dix itiduced2. Somiie xeecd oi
bthi Xwh112a1 ail ix r('grass geI'iiitatcci at thei 10ba lxi tttclitioni.
TIheI ret atix clY rap-idc gc't'niiiatol o111tf rx eglass wxit lim nited
Wti eeds that gc 'litii ate soiti after p ai it ing give 12miajo (I) 11)1-
k icli tl tilol' ii(lce. Iltrsilg show xis itg Xe lieu tl-ttptli-
i('5 iii's ar igh lltt xx iliclx bittsk. Se'eli oft xiici cr ops as 
citrit,
"Cot uuit l~tiilt I c'til tititlil sil ix clix il tiie surf 
ate. Weed11
xv l1111 tile xiittci- e iTCt1illatI' 1ex
1
iti thle (lixv I'iltlditiiolix
iitt stat Igi (t lon~itg xx iih the croitp. The' i'xiiil is stilt
Per cent
germination
100
80
6 0
40
20 -
0
24 48 72 96
100
24 48 7296
MARKETING ALABAMA CATFISH
E. W. McCOY, Department of Agricultural Economics and Rural Sociology
the basis of fish harvested, the average
weight per fish was about 0.9 lb. The
fish were directly marketed by producers
to four types of buyers, as shown below:
Type buyer
Processor
Pay-lake
Individual
Restaurant
Total
Thousand
lb. sold
2,008
79
222
26
2,335
CATFISH PRODUCTION in ponds repre-
sents a relatively new farm enterprise for
Alabama.
In 1968, about 500 acres of water
were stocked for intensive catfish pro-
duction. By 1970, 362 producers had
about 3,500 acres of surface water in
intensive catfish production. An addi-
tional number of producers had waters
stocked with catfish for fishout or per-
sonal use. In total, over 700 Alabama
producers were raising catfish under in-
tensive culture. The map indicates the
location and acreage of commercial pro-
duction in Alabama in 1970.
With the rapid growth of the catfish
industry, production and marketing dif-
ficulties were unearthed. Research was
developed to assist producers with prob-
lems of nutrition, disease, water quality,
and other production problems. Less at-
tention was given to problems of mar-
keting the finished product.
Catfish production typically follows a
pattern. Fingerling catfish are stocked
in a pond and fed until an appropriate
harvest weight is reached. The fish are
then removed from the pond and sold.
At the time of harvest the fish vary in
weight from 4 oz. to 2 lb. The diversity
in the size of fish represents a problem in
marketing.
Catfish buyers include processors, in-
dividuals, grocery stores, restaurants, fish
markets, and others. Individuals may
purchase fish for consumption or for re-
stocking in recreational pay lakes. Each
buyer may desire to purchase a specific
size of fish. A restaurant, for instance,
may desire fish with a dressed weight
between 4 and 6 oz. Since catfish have
a dressing percentage of 60%, sales to
the restaurant require a uniform batch
of fish with a live weight from 6 oz. to
10 oz. Fish not meeting the weight speci-
fications would not be acceptable. Direct
producer sales to institutional buyers re-
quire farm grading and processing of the
fish. No Alabama producer has sufficient
production to undertake these functions.
For producer marketing the individual
14
farmer has two alternatives. The scale
of production must be large: i.e. pro-
duction in excess of 1 million lb. a year,
or the scale must be very small, no more
than 9 or 10 1-acre ponds. With large-
scale production the producers can con-
tract weekly or monthly sales, guarantee
year round delivery, process his own and
other fish, accumulate quantities of de-
sirable sizes, and establishsales for vary-
ing sizes of fish. The small producer can
supply local fish markets, individuals, and
local restaurants when fish are available.
An alternative to individual producer
sales is cooperative arrangements for sales
and/or processing of fish. A group of
small producers can pool fish to amass
sufficient supply for processing or sales
to markets which the lone producer can-
not reach. Processors seldom will har-
vest ponds beyond a certain distance
radius from the plant. Also, processors
will not pick up less than a full truck-
load beyond some greater distance from
a plant. Producers with 1 or 2 acres of
fish are faced with the cost of harvesting
and hauling equipment if the production
unit is located over 100 miles from a
processing plant. The equipment is nec-
essary even though sales are not made to
processors. The costs for each producer
can be minimized if several producers
in an area jointly purchase the equip-
ment for mutual use.
In 1970, 1,880 acres of surface water
were harvested in Alabama. The har-
vested acreage represented approximately
55% of the acreage of surface water de-
voted to catfish production. At the be-
ginning of 1971 an inventory of catfish
was on hand in ponds. Much of the in-
ventory was involuntary. Producers were
willing to sell the fish but were unable
to find buyers. A severe shakedown of
the industry followed with many pro-
ducers switching to fishout production
or using catfish ponds for personal fish-
ing. Producers with established markets
expanded acreage. The 1,880 harvested
acres produced 2,335,000 lb. of catfish
or approximately 1,242 lb. per acre. On
Included in sales to individuals were
direct sales to grocery stores and fish
markets. The sales to pay-lake operators
occurred primarily during the summer
months, while the remaining sales oc-
curred during fall, winter, and spring
with the highest sales occuTing after
water temperatures dropped below 700
and the catfish ceased to gain weight.
Lack of buyers was the most prevalent
problem for catfish producers. The large
inventory of catfish on hand in ponds
was a symptom of the problem. A sec-
ond problem was price levels too low to
cover costs of production. The increase
in supplies and marketing during a lim-
ited time period drove the price down.
The catfish marketing system still does
not operate at maximum efficiency. The
number of fish available for marketing
is not known, in fact, only estimates of
the acreage in production are available.
Under existing marketing conditions pro-
ducers should be assured of a market
for the fish before the pond is stocked.
IAFiveEosees
Esimte acreagen of comeria catfish
prodctio andp loctio of~ prcesngpans
00
1001-299
A 0-2A
1- 9 929
.0102-
101_299 Ll.:2S9
101--
1129 29FiveHacre
A Procsin -La 
Sot
Estiatedacrege o comercil cafis
prodctio andlocaion f prcessng pants
1970.AL
The Process of Choice in 
Family Food Buying
RUTH A. HAMMETT', Department of Agricultural 
Economics and Rural Sociology
MILDRED VAN de MARK', Department of Home 
Economics Research
FOOD BUYING is a complex procedure
that is repeated many times in the life-
time of a homemaker. The assortment
of items purchased and the pressure of
selections are seldom the same. Each
shopping trip forces a series of decisions
of varying degrees on the homemaker.
Low income and stability in family size
are related to routine purchases, while
changes in income, type meal, health, or
residence may require extensive decision
making.
A model, based on the steps in prob-
lem solving that are related to home-
maker environment, information sources,
evaluations of product acceptability and
purchase, and use of food in the home,
was developed to organize findings from
18 years of consumer behavior research.
When food buying is regarded as a
"process" in which 
there are innumer-
able variations, it becomes possible to
organize data in an orderly manner.
"Process" may be defined as a sequence
of interrelated actions directed toward
some goal, purpose, or end. In prob-
lem-solving decisions, the process of
choice becomes part of a continuing
series of events rather than an isolated
instance.
Decision making is possible only when
a situation requiring action is present
and a selection must be made among
alternative solutions. The commonly ac-
cepted stages in decision making are:
identifying the problem, obtaining the
necessary information upon which to
base a decision, weighing the alterna-
tives, selecting a strategy for the course
of action, and reaching a positive, nega-
tive, or delayed decision. In a problem-
solving situation, responsibility must be
taken for the consequences of the deci-
sion.
Steps or stages jn decision making are
modified to fit the path taken by the
homemaker. After preparation is made
for the food buying trip, items are se-
lected and purchased, and then food is
stored in the home for later preparation
and service to family members. Addition
of the learning or experience role to the
steps in decision making transformed a
' Retired.
seemingly complex operation into a rela-
tively simple circular form.
Sources of food a e n Event of choice:
informatoion - Product evaluation
SAcceptance
of respon
sibility for HOME 
MARKET Event 
of
efoods I I ENVIRONMENT ENVIRONMENT4choice
:
prepara- , , projections
tion and c I
service in . I
the family \ .
group C \
Event of Event of purchase
consumptionI
The Model
The dynamics of the process of choice
used in food buying decisions by home-
makers are shown in the figure. Steps 1
and 6 occur largely in the home. Step
2 may be inventory control, interaction
with family members, or forecasting of
meal service, but it also includes out-
side sources of information that may re-
sult in improved food management, more
healthful foods, or use of new products
through personal communication or the
mass media. Steps 3, 4, and 5 occur
in the market environment, usually the
local food store, where much ...of the
research in consumer behavior has been
concentrated. The arrows in the margin
symbolize the collection and use of ex-
perience at every stage in the process of
food purchase and consumption.
1. Role Acceptance and Home En-
vironment. Pertinent information about
the respondent includes attitudes toward
the homemaker role and food shopping,
nutritional and marketing knowledge and
their implementation, food selection and
preparation skills, availability of storage
and kitchen equipment, and access to
food information sources such as news-
papers. Family activities, preferences
and needs, and family members' attitudes
toward the homemaker's performance
also are important factors in food buy-
ing decisions.
2. Sources of Food Information. Step
2 of the process of choice is of great
importance to all phases of the food in-
dustry and to agencies concerned with
the health of human populations. What
information to present and how it should
be implemented are exceedingly com-
plex, but immensely important problems,
if our national resources are to be used
wisely.
3. Event of Choice- Product Evalua-
tion. Aspects of consumer attitudes and
practices would include store selection,
price reduction appeals, merchandising
techniques, quality standards or grade,
knowledge and use of consumer aids,
new foods or forms, convenience items,
packaging, and purchase of nonfoods in
food stores. Attributes of product ap-
pearance, quality, and price also are con-
sidered at this point.
4. Event of Choice - Mental Projec-
tions. Limitations, such as family tastes,
meal type, items on hand, equipment or
culinary skills, and usual food expendi-
tures, must be considered by the home-
maker in estimating the probable success
of one product over another in provid.
ing the desired family satisfaction.
5. Event of Purchase. In a recent
study, per capita income accounted for
slightly over half the explained variation
in amount spent for food, while family
size and stage in the family life cycle were
responsible for most of the remainder.
6. Event of Consumption. Experience
with the product in the home leads to
future inclusion as a habitual purchase
or permanent rejection for products fail-
ing to meet expectations, with numerous
variations on frequency of purchase or
intermittent selections.
Use of the Model in Future Research
The model also would apply to the
individual who purchases some meals,
the consumer with a home garden, the
dieter, the person living alone, and
groups such as communes or college stu-
dents in an apartment, as well as to the
nuclear family.
Grow Healthy Calves in Portable 
Pens
G. W. BENZ, Dept. of Animal Health Research
T IE 1 1T B L i i'1N- Xx t CIO f or F I~ l~
(ir ,iV clvesC got its star t iii *Auiiiii tooi e
111,11 2)) x eal ago. 1)ir. L. 11. 
1
lxiof
tile L SbA lBegioilli Palrasite Rese'aircl
1LlaioratorI irs XIlisei tilt' roaililfgeinil!
luetilllti(111iltiltd (ixle to 11)ttitioii
x ariolis diseasesC'.
liiliXidiIl pciIX Xwe(re Ililitl of' iigiit-
wXeight frin iiex xwitii XXire ieiieiiig toil-
fille the cix CX. T he peiix XX tie iliox ed
to freshi grounlid eXv(ry fCX- dlaX X. W\eatiher
jiritectioli \its piroxvided by coxverig one I
eiid (if tile peiiwixx ita roof and C eicosiing
oiie Cnd dluinig xxiiiter ilollilI.
Later ireseariic eiet tihat tue i)Cii
xwere miore su itaiblie for d iseaseX cI 11111
when u i sted wXiti Isllattted floorX to kccp
eaix Cs oif tue grounid. tit oriiginiai wi,
cain ihe moonited oin a piithoroi oif xx tanh ii1
Xlats iiaiieti toi skids, iliir C i SltX .ii
ibe miadeiz wXitih 2- x (5-in. botardX treailJ
XXise' downX the ceiltcr atl ait)0 al U
Ties i lat iit Ililie tot skitds, lX iii'_
opeinigs (of ablout I ili. iietXX (e'I thill
])I I-ppilgs fl tiiioilgil tiit' op'11ig5.
ibt't'i iiiale that oflcr s till fulltiier id
and1( stiil piovide' thie icesa -C'Xl v i sililt il
X onhg cailvtX. BuocktX 
for xx .tcr io itI
position andI it dtoor isi avxailabl l oi t'
1
iti
calif ol tiie ioppos ite s'Xide. (:ili s X sX t in tedt
ill thes iii liill i'lrl I ll ig tilt e lull ( ii ri
I l rt 11111h r til' ii ('1( \ ('s cll('el('X aiised
illg i ii i ]l(tll bV 
1
)t'IlXli he 111(111e
it'~ (101 illl IX iil b\ d'iiS frc I ci li4tilt is
PL~g ICION HalIhlightcs ofd t lii
Ahericultol Roeac 1una 2 ea73 h1HeM
enorth for Prlvote User $300iiil ale
AGRICL 245A EXERMETO STON
AUBRNABAMA 3683039
R. Dnni RoseDircto
FIG. 1 (left). Slatted floors make portable
pens even more effective. FIG. 2 (right).
Pers that provide space for several calves
showed advantages in Auburn research.
1 IlI go od. Occasonial lienlIato)de oxva
hlaXe C ilell obs'erve X dutiriiig f'cal eximi-
ililtjolls. buit this %\it aX bib , vlhli tihe reslt
of, cakes CX ilig ('\poscdt to infletiXvC
lira b Clefore~t piii tilsl
()ix' it few probiemsX hiave enl Cii-
tomicie ' ill iXiig tlIC penis. Tile slatsi
hel f11 irs xl ised had sharlp ediges that
cIioise'( soict mi11nor leg diisorderis.. A fe\\
(iXk CX 1,1( filuid ill-vtlillilatiolls oXver knee,(
oiits ili tihe front legs at 12-1.5 wXeeks
illllgC. 'I'lle((1 oiit capsle were iiCoX oC1
itlldl to 1)w niX oled alt plost 101)1 U iiil
Cxaliiiiatioi %ie imCI11 experimenit wits
[Cli 111in lteti.
((i'are ill tiiii g the pens Is needed to
axvoidi g iods groinOXg ii) thriougih till'
CXSlilt ill colialillltjil wXitih X liliX
POSTAGE PAID
U.S. DEPARTMENT OF
AGRICULTURE 
c..Mii
AGR 101US.MI
DR.
D-6
AresS
__ 0i 'Ied nnti11ar'b
L 1 Ssm~ unknown