Earth & Environmental Sciences
tillage
100%
zero tillage
86%
Mollisol
67%
soil
56%
maize
51%
soil nitrogen
46%
nitrogen
44%
soil carbon
44%
physical property
40%
agricultural ecosystem
39%
nitrous oxide
35%
particulate organic matter
34%
fertilizer
28%
wheat
27%
phosphorus
24%
effect
22%
organic soil
21%
soil test
21%
tropical soil
21%
soybean
20%
aggregate stability
18%
crop rotation
18%
macroaggregate
17%
Oxisol
17%
Vertisol
17%
crop
15%
chemical property
15%
organic carbon
14%
grassland
14%
soil water
13%
bulk density
13%
soil drainage
13%
drainage
12%
soil depth
12%
soil type
12%
growing season
11%
in situ
11%
urea
8%
soil temperature
7%
flowering
7%
province
6%
crop yield
6%
soil property
6%
cation exchange capacity
6%
water storage
5%
carbon
5%
organic matter
5%
Agriculture & Biology
no-tillage
68%
soil organic carbon
60%
tillage
60%
soil organic nitrogen
53%
Mollisols
51%
soil
51%
particulate organic matter
48%
Argentina
47%
soil physical properties
39%
corn
38%
minimum tillage
29%
soil nutrient balance
27%
phosphorus
25%
wheat
24%
nitrogen
24%
nitrous oxide production
23%
stand age
22%
plows
20%
Helianthus annuus
20%
nitrogen fertilizers
20%
nitrous oxide
19%
bulk density
19%
nitrogen balance
19%
grain yield
18%
agroecosystems
18%
mineralization
18%
organic production
17%
soil organic matter
16%
conventional tillage
16%
alfalfa
15%
soil water
14%
physical properties
13%
soybeans
13%
physicochemical properties
13%
water holding capacity
13%
cation exchange capacity
10%
crop yield
10%
soil depth
9%
crops
9%
dietary minerals
9%
Argiudolls
8%
total nitrogen
8%
soil properties
8%
carbon
8%
soil water storage
8%
acidity
7%
Pampas region
7%
soil temperature
7%
soil buffering capacity
7%