Agriculture & Biology
tillage
75%
Western Africa
66%
nitrogen fertilizers
63%
reduced tillage
61%
corn
59%
ridge tillage
49%
cotton
49%
conservation tillage
40%
savannas
39%
planting date
37%
Burkina Faso
37%
Benin
37%
Sudan
35%
nutrient use efficiency
35%
canola
34%
global warming
33%
fertilizer application
33%
soil properties
31%
soil types
31%
crop residues
27%
sowing
26%
buffers
25%
soil nutrients
24%
crop residue management
20%
soil
20%
cultivars
18%
topsoil
17%
landscape position
17%
soil fertility
14%
planting
14%
sustainable agriculture
11%
nutrients
11%
conservation practices
10%
climate
10%
land restoration
9%
gravel
9%
organic carbon
8%
ecosystem services
8%
total nitrogen
8%
soil pH
7%
growing season
7%
farms
7%
soil water
6%
weather
6%
production technology
6%
bolting
6%
potassium
5%
uptake mechanisms
5%
Earth & Environmental Sciences
tillage
100%
maize
84%
West Africa
67%
cotton
63%
conservation tillage
42%
savanna
41%
fertilizer application
39%
nitrogen
37%
crop residue
37%
fertilizer
36%
soil type
29%
soil
28%
soil property
27%
soil nutrient
25%
warming
24%
Africa
23%
management practice
18%
soil fertility
16%
effect
15%
topsoil
15%
crop production
13%
nutrient
11%
smallholder
9%
crop
8%
farm
8%
production system
8%
trial
8%
incorporation
8%
gravel
7%
ecosystem service
7%
potassium
6%
soil moisture
6%
loss
6%
organic carbon
6%
restoration
5%
dose
5%
phosphorus
5%
productivity
5%
erosion
5%