Earth & Environmental Sciences
agricultural practice
79%
nitrate
52%
surface water
49%
nitrogen
43%
crop
26%
loss
24%
drainage
13%
drainage water
10%
credit
10%
production system
9%
tillage
9%
agricultural production
9%
cropping practice
9%
manure
8%
soil organic matter
8%
management practice
8%
river basin
7%
nutrient
5%
economics
5%
material
3%
rate
2%
effect
2%
Engineering & Materials Science
Surface waters
100%
Nitrates
91%
Nitrogen
67%
Drainage
29%
Manures
12%
Biological materials
11%
Nutrients
11%
Tile
10%
Rivers
8%
Animals
8%
Soils
7%
Economics
5%
Chemical Compounds
Surface Water
76%
Nitrate
54%
Nitrogen
43%
Tillage
18%
Drainage Water
15%
Soil Organic Matter
13%
Nutrient
9%
Amount
3%
Time
3%
Application
2%