Agriculture & Biology
tillage
91%
Vicia
82%
legumes
77%
no-tillage
68%
green manures
64%
corn
59%
moldboard plows
57%
nitrogen
54%
weed control
51%
reduced tillage
34%
mineralization
26%
herbicides
22%
weeds
22%
Vicia villosa
18%
crop-weed competition
18%
soil minerals
17%
demonstration farms
16%
mineral fertilizers
14%
grain crops
14%
pesticide application
13%
soil quality
12%
nitrogen fertilizers
12%
planting
10%
fertilizers
10%
minerals
10%
degradation
8%
Earth & Environmental Sciences
tillage
100%
maize
74%
green manure
71%
productivity
65%
nitrogen
56%
weed
53%
weed control
51%
herbicide
36%
effect
22%
fertilizer
20%
mineral
19%
mineralization
17%
cereal
12%
soil quality
12%
planting
11%
farm
10%
experiment
9%
decomposition
8%
demand
7%
soil
5%