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| Corn -- Field experiments (4) |
| Cotton -- Field experiments (4) |
| Cotton growing (4) |
| Cotton -- Fertilizers (3) |
| Corn -- Fertilizers (2) |
| Chufa -- Fertilizers (1) |
| Chufa -- Field experiments (1) |
| Corn (1) |
| Corn -- Varieties (1) |
| Cotton (1) |