OpenAGRICOLA
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- pollution control[remove]2
- water pollution[remove]2
- water quality[remove]2
- watersheds[remove]2
- agrochemicals1
- animal manures1
- arable soils1
- crop production1
- erosion control1
- excreta1
- farmers1
- farmers' attitudes1
- feedlots1
- low input agriculture1
- nitrogen1
- nonpoint source pollution1
- phosphorus1
- riverbank protection1
- runoff1
- soil conservation1