Agriculture & Biology
alley cropping
100%
agroforestry
92%
biomass
68%
Superior National Forest
68%
Spartina pectinata
58%
land use planning
51%
cropping systems
49%
logging
46%
edge effects
46%
willows
43%
fuels (fire ecology)
41%
biosphere
41%
energy crops
41%
tile drainage
38%
bioenergy
38%
crops
36%
nontimber forest products
34%
wetlands
33%
subsurface drainage
32%
land use
30%
farm forestry
27%
Salix
27%
drainage water
27%
aquaponics
26%
Populus
26%
silvopastoral systems
23%
agricultural land
23%
forest industries
23%
polyculture (aquaculture)
22%
pollution load
22%
governance
22%
Ziziphus
22%
carbon sinks
20%
Alnus
20%
landowners
20%
nutrients
19%
snow
19%
income
19%
Bangladesh
19%
germplasm conservation
18%
Salix purpurea
18%
Central America
18%
fish
18%
Panicum virgatum
18%
farmers
17%
woodlands
17%
profitability
16%
nutrient uptake
16%
Earth & Environmental Sciences
agroforestry
93%
biosphere reserve
69%
community forestry
64%
alley cropping
60%
biomass
55%
crop
44%
Central America
39%
cost
36%
nontimber forest product
35%
landowner
33%
profitability
33%
harvest
32%
farm
30%
forest management
29%
wetland
26%
conservation genetics
26%
market
25%
timber forest
25%
project
24%
drainage water
23%
income
22%
vegetable
21%
forestry
21%
timber
20%
phosphorus
20%
livestock
20%
productivity
19%
policy
19%
cost-benefit
19%
natural resource
19%
forage
18%
rights
18%
nutrient
17%
drainage
17%
creek
16%
deforestation
16%
norm
16%
woodland
16%
photosynthetically active radiation
16%
alternative energy
15%
tree planting
15%
prairie
15%
removal
15%
grazing
15%
nitrate
15%
seed
14%
domestication
14%
innovation
14%
Social Sciences
biosphere reserve
58%
forestry
46%
conservation
34%
farmer
30%
Guatemala
26%
wetland
22%
moral obligation
22%
costs
21%
value chain
20%
market
20%
Central America
20%
Water resources
20%
renewable energy
18%
profitability
18%
natural resources
17%
resources
13%
management
12%
India
12%
energy
11%
livelihood
11%
activation
11%
governance
11%
energy production
11%
Government regulation
10%
energy source
10%
industry
10%
River watershed
9%
technology transfer
9%
Geographical Information System
9%
environmental damage
9%
research facility
9%
diversification
8%
Water conservation
8%
land use
8%
experience
8%
performance
7%
water pollution
7%
Tourism
7%
income
7%
incentive
6%
developing country
6%
farm
6%
campaign
6%
Water drainage
6%
responsibility
6%
manager
6%
interconnection
5%
threat
5%
economy
5%