Agriculture & Biology
soil organic carbon
88%
soil
84%
particulate organic matter
83%
soil organic matter
66%
tillage
64%
soil quality
58%
no-tillage
51%
carbon sequestration
47%
carbon
28%
cropping systems
26%
soil carbon
25%
organic production
24%
farming systems
23%
organic soils
23%
corn
22%
clay
21%
mineralization
20%
conventional farming
19%
soybeans
18%
greenhouse gas emissions
17%
land use change
16%
particulates
16%
permanganates
15%
biofuels
15%
cropland
15%
nitrogen
15%
animal manures
15%
soil structure
14%
biomass
14%
emissions factor
13%
fluorescein diacetate hydrolysis
13%
ecosystem services
13%
farmers
12%
aggregate stability
12%
soil aggregation
12%
crops
12%
Mollisols
12%
deterioration
12%
agriculture
11%
conventional tillage
11%
cover crops
11%
microbial biomass
10%
soil properties
9%
National Institute of Food and Agriculture
9%
soil resource management
9%
rangeland soils
9%
conservation practices
8%
soil depth
8%
energy crops
8%
anion-exchange membranes
8%
Earth & Environmental Sciences
soil
100%
tillage
72%
particulate organic matter
52%
organic carbon
51%
soil quality
43%
soil organic matter
43%
maize
38%
zero tillage
38%
soil carbon
37%
organic farming
21%
aggregate stability
19%
manure
19%
organic matter
19%
crop
18%
indicator
18%
organic soil
16%
land use change
15%
nitrous oxide
15%
biofuel
15%
biomass
14%
soil emission
13%
greenhouse gas emissions
13%
emission factor
13%
mineralization
12%
management practice
12%
effect
12%
crop rotation
11%
loam
11%
soil structure
10%
cropping practice
10%
clay
10%
Mollisol
9%
modeling
9%
rate
9%
silt
9%
humic substance
9%
nitrogen
9%
biofuel production
8%
