Agriculture & Biology
cover crops
100%
legumes
45%
soil
42%
tillage
31%
nitrogen
31%
Trifolium ambiguum
30%
Rhizobium
28%
corn
26%
Trifolium incarnatum
22%
nitrogen fixation
20%
Inga oerstediana
19%
organic production
19%
biomass
18%
Anthrosols
17%
nodulation
16%
mulches
16%
no-tillage
16%
rye
14%
crops
13%
cash crops
12%
agroecosystems
12%
discing
12%
vegetables
11%
Mexico
11%
soybeans
11%
Inga (Fabaceae)
11%
mineralization
11%
Pisum sativum subsp. sativum var. arvense
11%
Vicia
10%
winter
10%
winter annuals
10%
farmers
10%
farming systems
9%
soil organic matter
9%
permanganates
9%
Rhizobium leguminosarum
9%
cropping systems
8%
soil mineralogy
8%
ecosystem services
8%
planting
8%
weeds
8%
summer
8%
degradation
7%
nitrogen-fixing trees
7%
soot
7%
flails
7%
strip tillage
7%
microbial communities
7%
labile carbon
7%
Medicine & Life Sciences
Rhizobium
58%
Soil
57%
Fabaceae
43%
Vicia
38%
Biomass
32%
Nitrogen Fixation
23%
Rhizobium leguminosarum
20%
Zea mays
18%
Medicago
16%
Nutrients
15%
Organic Agriculture
14%
Nitrogen
14%
Vegetables
13%
Soybeans
12%
Farmers
12%
Leghemoglobin
11%
Ecosystem
11%
Coffee
11%
Symbiosis
11%
Peas
9%
Fertilizers
9%
Vigna
9%
Weed Control
9%
Coffea
8%
Fungi
8%
Farms
8%
Nitrification
7%
Trifolium
7%
Midwestern United States
7%
Genotype
7%
Crop Production
7%
Grassland
6%
Trehalose
6%
Fertility
6%
Malawi
6%
History
6%
Sepia
5%
Food
5%
Physiological Stress
5%
Microbiota
5%
Bacteria
5%
Genetic Variation
5%
Denitrification
5%
Nitrates
5%
Arthropods
5%
Earth & Environmental Sciences
cover crop
45%
rhizobacterium
35%
soil
31%
nodulation
24%
tillage
24%
maize
22%
cropping practice
20%
biological nitrogen fixation
19%
nitrogen
18%
mulch
18%
biomass
17%
coffee
16%
black carbon
16%
organic farming
12%
agricultural ecosystem
12%
nitrogen fixation
11%
till
11%
farming system
11%
genotype
10%
nutrient
10%
vegetable
9%
carbon
9%
planting
9%
cash crop
8%
mineralization
8%
farmers knowledge
7%
crop
7%
soil quality
7%
fixation
7%
combination effect
7%
fertility
7%
weed
6%
soil nitrogen
6%
microbial community
6%
ground cover
6%
winter
6%
inoculation
6%
cation exchange capacity
6%
conservation tillage
6%
soil organic matter
6%
inorganic nitrogen
6%
bacterium
6%
soil carbon
6%
soil nutrient
6%
genetic diversity
5%
community composition
5%
water yield
5%
soil process
5%
decomposition
5%
shading
5%