Agriculture & Biology
nitrogen cycle
100%
global change
90%
oxidation
39%
denitrification
39%
soil
38%
mineralization
32%
testing
29%
ammonia
27%
nitrites
22%
annual grasslands
17%
nitrification
12%
nitrogen
12%
microbial activity
11%
soil temperature
11%
soil pH
10%
long term effects
10%
ammonium
10%
soil sampling
9%
soil water
9%
nitrates
9%
dates (fruit)
8%
ecosystems
8%
temperature
4%
Earth & Environmental Sciences
soil nitrogen
87%
environmental change
64%
soil
32%
oxidation
30%
denitrification
25%
ammonia
22%
warming
22%
mineralization
21%
immobilization
19%
global change
18%
nitrite
17%
effect
17%
grassland ecosystem
11%
long-term effect
10%
soil temperature
9%
microbial activity
9%
nitrification
8%
field experiment
8%
ammonium
7%
soil moisture
7%
nitrate
6%
rate
6%
nitrogen
5%
indicator
5%
experiment
3%
temperature
3%