OpenAGRICOLA
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- erosion control[remove]3
- pollution control3
- surface water[remove]3
- water pollution3
- water quality[remove]3
- arable soils2
- crop production2
- soil conservation2
- animal manures1
- costs and returns1
- cropping systems1
- decision making1
- excreta1
- farmers' attitudes1
- farming systems1
- feedlots1
- fences1
- lakes1
- land use1
- low input agriculture1