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| crop rotation (2) |
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| alfalfa county (1) |
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| control (1) |
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| logan county (1) |
| crop rotation (2) |
| field experiments (2) |
| oklahoma (2) |
| soil fertility (2) |
| alfalfa county (1) |
| application (1) |
| brush (1) |
| control (1) |
| herbicides (1) |
| logan county (1) |