| The Thomases' crop rotation includes soybeans, blue corn, popcorn, wheat and barley. |
| His initial efforts were devoted to improving the condition of his fields and implementing a system of crop rotation which would build them up. |
| This, along with a diverse crop and cover crop rotation, seems to discourage the buildup of their populations. |
| The cotton-flax crop rotation provides producers an alternative crop for traditionally dormant fields. |
| Northern European farmers also began to experiment with the three-field system of crop rotation. |
| He uses cow manure, green manure and crop rotation to ensure nutrient-rich soil for his rapeseed crop. |
