Agriculture & Biology
subsurface drainage
100%
drainage
53%
cold zones
37%
Corn Belt region
21%
nitrate nitrogen
19%
drainage systems
19%
spatial distribution
18%
hydrology
18%
computer simulation
17%
economic feasibility
17%
nitrates
16%
soybeans
15%
rye
15%
water table
15%
tile drainage
14%
DRAINMOD model
12%
tiles
12%
horticultural crops
12%
irrigation
12%
water quality
11%
soil
11%
growth models
11%
cover crops
9%
prediction
9%
pipes
9%
corn
9%
irrigation systems
8%
computer-aided design
8%
simulation models
7%
profitability
7%
soil penetration resistance
7%
calibration
6%
snowmelt
6%
environmental sustainability
6%
water requirement
6%
clay soils
5%
perennial grasses
5%
meta-analysis
5%
spring wheat
5%
nitrogen
5%
rivers
5%
crop yield
5%
soil temperature
5%
crops
5%
Engineering & Materials Science
Drainage
99%
Nitrates
41%
Water quality
32%
Hydrology
25%
Nitrogen
21%
Soils
20%
Fertilizers
14%
Tile
13%
Water
12%
Rivers
11%
Wetlands
10%
Sump pumps
8%
Runoff
8%
Organic carbon
7%
Nutrients
7%
Biological materials
6%
Watersheds
6%
Clay
6%
Sediments
6%
Flow measurement
5%
Biodiversity
5%
Catchments
5%
Pesticides
5%
Calibration
5%
Earth & Environmental Sciences
drainage
51%
nitrate
23%
crop
16%
tile drain
15%
spacing
13%
drain
12%
hydrology
12%
water quality
11%
distribution system
11%
nitrogen
10%
loss
10%
drainage system
10%
soil
9%
fertilizer
8%
irrigation
7%
fertilizer application
7%
modeling
7%
maize
7%
nitrogen load
6%
cropping practice
6%
profitability
5%
environmental sustainability
5%
farming system
5%
nitrous oxide
5%
economics
5%
prediction
5%
soil temperature
5%