Earth & Environmental Sciences
fertilizer
100%
trial
78%
nutrient
75%
tropical soil
72%
fertility
61%
maize
51%
mineral fertiliser
50%
manure
37%
biological nitrogen fixation
30%
leaching
29%
recommendation
29%
crop
27%
evaluation
27%
nutrient balance
27%
land use
25%
tropical environment
24%
soil map
23%
nitrogen
23%
weed
22%
site selection
21%
bypass
21%
arable land
21%
subsidy
21%
tropical region
21%
soil nutrient
20%
thesis
20%
atmospheric deposition
20%
clay soil
20%
rhizosphere
19%
cracking (fracture)
19%
denitrification
17%
soil property
17%
soil
16%
farm
16%
potassium
16%
continent
15%
agricultural land
15%
Africa
14%
sustainability
14%
sedimentation
14%
phosphorus
13%
productivity
13%
erosion
13%
decision
12%
policy
11%
methodology
11%
land
10%
climate
10%
removal
10%
chemical
9%
test
7%
parameter
6%