Earth & Environmental Sciences
green manure
100%
cover crop
88%
incorporation
55%
nitrogen
39%
crop
35%
green manuring
30%
soil
28%
day length
24%
overwintering
21%
immobilization
16%
cropping practice
16%
soil temperature
16%
nitrification
15%
trial
13%
leaching
12%
sustainability
12%
mineralization
12%
nitrate
12%
organic matter
11%
winter
10%
vegetation
10%
loss
8%
rate
5%
effect
3%
Agriculture & Biology
green manures
79%
cover crops
73%
nitrogen
38%
immobilization in soil
27%
crops
26%
soil
25%
nitrogen retention
20%
nitrification
19%
Scotland
18%
soil temperature
17%
overwintering
17%
United Kingdom
16%
mineralization
16%
leaching
16%
oats
15%
soil organic matter
15%
field experimentation
14%
nitrates
13%
photoperiod
13%
vegetation
12%
uptake mechanisms
11%
winter
10%