Agriculture & Biology
cover crops
100%
Vicia villosa
57%
legumes
47%
soil
41%
tillage
30%
nitrogen
30%
Trifolium ambiguum
29%
Rhizobium
27%
nitrogen fixation
23%
corn
23%
organic production
22%
Trifolium incarnatum
22%
nodulation
20%
Inga oerstediana
18%
biomass
17%
mulches
15%
winter annuals
15%
no-tillage
15%
rye
13%
crops
13%
cash crops
13%
cropping systems
12%
winter
12%
vegetables
11%
agroecosystems
11%
soybeans
11%
discing
11%
Pisum sativum subsp. sativum var. arvense
11%
soil quality
11%
Mexico
10%
Inga (Fabaceae)
10%
mineralization
10%
Vicia
10%
soil organic matter
9%
farmers
9%
farming systems
9%
permanganates
8%
Rhizobium leguminosarum
8%
soil mineralogy
8%
ecosystem services
8%
summer
7%
planting
7%
weeds
7%
degradation
7%
nitrogen-fixing trees
7%
soot
7%
flails
7%
curriculum
7%
Trifolium pratense
6%
Medicine & Life Sciences
Soil
63%
Rhizobium
54%
Vicia
44%
Fabaceae
42%
Biomass
30%
Nitrogen Fixation
21%
Rhizobium leguminosarum
19%
Zea mays
17%
Medicago
15%
Nutrients
15%
Nitrogen
14%
Vegetables
14%
Organic Agriculture
13%
Soybeans
12%
Nitrification
12%
Farmers
12%
Leghemoglobin
11%
Ecosystem
10%
Coffee
10%
Symbiosis
10%
Mexico
9%
Peas
9%
Fertilizers
9%
Vigna
9%
Weed Control
8%
Food
8%
Coffea
8%
Fungi
7%
Farms
7%
Trifolium
7%
Fertility
7%
Midwestern United States
6%
Genotype
6%
Crop Production
6%
Grassland
6%
Lycopersicon esculentum
6%
Trehalose
6%
Malawi
5%
History
5%
Sepia
5%
Education
5%
Physiological Stress
5%
Climate
5%
Microbiota
5%
Earth & Environmental Sciences
cover crop
49%
rhizobacterium
33%
soil
31%
nodulation
30%
tillage
23%
cropping practice
22%
maize
21%
biological nitrogen fixation
18%
biomass
17%
nitrogen
17%
mulch
17%
nitrogen fixation
16%
coffee
15%
black carbon
15%
organic farming
12%
agricultural ecosystem
11%
till
10%
farming system
10%
genotype
10%
nutrient
10%
winter
9%
planting
9%
vegetable
9%
carbon
8%
soil quality
7%
cash crop
7%
education
7%
crop
7%
farmers knowledge
7%
fixation
7%
food
7%
combination effect
6%
fertility
6%
weed
6%
health
6%
soil nitrogen
6%
microbial community
6%
ground cover
6%
soil organic matter
6%
inoculation
6%
cation exchange capacity
6%
bacterium
6%
conservation tillage
5%
inorganic nitrogen
5%
soil carbon
5%
soil nutrient
5%
curriculum
5%
genetic diversity
5%
soybean
5%