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| field experiments (6) |
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| sorghum (1) |
| vegetables (1) |
| yield (1) |
| field experiments (6) |
| oklahoma (6) |
| varieties (6) |
| yields (3) |
| cotton (2) |
| forage plants (1) |
| grain (1) |
| sorghum (1) |
| vegetables (1) |
| yield (1) |