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- pollution control[remove]3
- water pollution[remove]3
- watersheds[remove]3
- surface water2
- water quality2
- agrochemicals1
- animal manures1
- arable soils1
- crop production1
- erosion control1
- excreta1
- farmers1
- farmers' attitudes1
- feedlots1
- hydrology1
- losses from soil1
- low input agriculture1
- nitrate nitrogen1
- nitrates1
- nitrogen1