Simulated long-term nitrogen losses for a midwestern agricultural watershed in the United States

Agriculture & Biology

• agricultural watersheds 100%
• nitrates 50%
• nitrogen 35%
• fertilizer application 25%
• calibration 19%
• nitrate reduction 17%
• nonpoint source pollution 10%
• alternative crops 9%
• Midwestern United States 8%
• model validation 8%
• agricultural management 8%
• application timing 8%
• corn 8%
• water table 8%
• cropland 8%
• topography 7%
• mathematical models 6%
• pastures 5%
• climate 5%
• soybeans 4%
• nutrients 4%
• crops 3%

Earth & Environmental Sciences

• watershed 44%
• nitrate 43%
• nitrogen 36%
• loss 32%
• fertilizer application 25%
• calibration 11%
• maize 9%
• crop 7%
• agricultural management 6%
• nonpoint source pollution 6%
• agricultural practice 5%
• soybean 5%
• rate 5%
• pasture 5%
• water table 5%
• management practice 4%
• replacement 4%
• GIS 4%
• topography 3%
• nutrient 3%
• simulation 2%