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- application rate[remove]3
- application timing[remove]3
- watersheds[remove]3
- groundwater contamination2
- leaching2
- nitrate nitrogen2
- Zea mays1
- agricultural runoff1
- alachlor1
- atrazine1
- continuous cropping1
- crop production1
- crop yield1
- denitrification1
- drainage water1
- geographic information systems1
- herbicide residues1
- laws and regulations1
- loess soils1
- losses from soil1