Earth & Environmental Sciences
cover crop
100%
cropping practice
74%
planting
73%
maize
66%
fallow
24%
weed
23%
crop residue
15%
biomass
15%
soil depth
12%
wheat
11%
soil water
10%
soil nutrient
8%
harvest
7%
underwater environment
6%
winter
5%
soil nitrogen
4%
semiarid region
4%
soil organic matter
3%
water use
3%
growing season
3%
management practice
3%
experiment
3%
water content
3%
plain
3%
nitrate
3%
crop
2%
productivity
2%
nitrogen
2%
economics
2%
summer
2%
loss
2%
soil
1%
water
1%
effect
0%
Agriculture & Biology
cover crops
82%
cropping systems
71%
planting
58%
corn
46%
fallow
24%
cover crop termination
16%
crop residues
15%
weeds
15%
soil depth
15%
grain yield
14%
biomass
14%
soil nutrients
9%
winter wheat
8%
soil water
7%
energy crops
5%
crop management
5%
arid zones
4%
total nitrogen
4%
soil water content
4%
soil
4%
soil organic matter
4%
weed control
4%
nitrates
3%
water
3%
growing season
3%
economics
3%
summer
3%
wheat
3%
nitrogen
2%
crops
2%