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