Agriculture & Biology
cropland
100%
soil organic carbon
93%
China
52%
Anthrosols
24%
soil types
20%
paddy soils
17%
Alisols
13%
Acrisols
11%
Fluvisols
10%
rivers
10%
soil surveys
10%
Cambisols
9%
Chernozems
9%
national surveys
8%
carbon sinks
8%
carbon sequestration
7%
agricultural soils
7%
soil profiles
7%
soil
6%
standard deviation
6%
crop yield
6%
history
5%
sampling
2%
Earth & Environmental Sciences
organic carbon
63%
soil
35%
soil type
14%
Acrisol
7%
Fluvisol
7%
Cambisol
6%
Chernozem
6%
soil survey
6%
carbon stock
5%
crop yield
5%
agricultural soil
5%
river
5%
soil profile
4%
carbon sequestration
4%
sampling
2%
history
2%
modeling
2%
Chemical Compounds
Organic Carbon
90%
Soil
69%
Sampling
3%
Carbon Atom
1%
Reaction Yield
1%