Physics & Astronomy
agriculture
16%
availability
11%
carbon
7%
chambers
8%
fertilization
85%
fertilizers
52%
gases
11%
irrigation
16%
nitrogen
8%
nitrogen oxides
77%
sampling
9%
soils
57%
sugar cane
100%
tropical regions
13%
ureas
40%
Earth & Environmental Sciences
agriculture
9%
Andisol
20%
carbon
7%
denitrification
12%
developing world
11%
experimental study
11%
farming system
14%
fertilizer
35%
gas
14%
Inceptisol
19%
irrigation
10%
laboratory
7%
loss
7%
management practice
12%
Mollisol
19%
nitrification
12%
nitrogen
8%
nitrogen oxides
56%
sampling
7%
soil
23%
soil type
12%
sugar cane
74%
tropics
12%
urea
42%
Agriculture & Biology
agriculture
5%
Andisols
10%
carbon
4%
denitrification
8%
fertilizers
10%
gas emissions
9%
gases
5%
Hawaii
7%
Hawaii (island)
20%
Inceptisols
9%
irrigation
5%
Maui
30%
Mollisols
10%
nitrification
8%
nitrogen
4%
nitrogen fertilizers
6%
nitrogen oxides
75%
nitrous oxide
62%
sampling
2%
soil
27%
soil types
6%
sugarcane
50%
temperate zones
7%
tropics
6%
urea
16%
Chemical Compounds
Carbon Atom
6%
Denitrification
17%
Fertilizer
50%
Gas
14%
Irrigation
20%
Nitrification
21%
Nitrogen
8%
Nitrogen Oxide
66%
Sampling
11%
Soil
46%
Surface
4%
Time
4%
Urea
32%