Agriculture & Biology
Spodosols
100%
forest soils
58%
soil
50%
forest litter
44%
sulfates
43%
dissolved organic carbon
42%
organic horizons
40%
sulfur
39%
soil solution
34%
denitrification
30%
Picea
28%
chemistry
27%
B horizons
24%
mineral soils
24%
leaching
23%
sediments
23%
tiles
22%
mineralization
21%
nitrates
20%
nitrogen
19%
leachates
18%
Miscanthus giganteus
16%
Adirondacks
16%
tile drainage
16%
energy crops
15%
soybeans
15%
Northeastern United States
15%
adsorption
15%
acids
15%
soil chemistry
14%
hardwood
14%
Miscanthus
14%
corn
14%
Panicum virgatum
13%
cations
12%
nitrogen cycle
12%
hardwood forests
11%
carbon
11%
acid soils
11%
soil organic matter
10%
Alfisols
10%
vegetation
10%
extractors
10%
buried soils
10%
bottomland soils
10%
throughfall
10%
sewage effluent
10%
upland forests
10%
deaeration
10%
constructed wetlands
9%
Earth & Environmental Sciences
Spodosol
99%
soil
75%
forest floor
61%
watershed
56%
forest soil
55%
nitrogen
54%
sulfur
47%
maize
40%
denitrification
39%
sulfate
38%
loss
26%
mineral
24%
river
23%
leaching
21%
crop
20%
lake
20%
mineralization
19%
organic acid
19%
cation
19%
leachate
19%
brook
18%
sediment
18%
agricultural ecosystem
17%
organic carbon
16%
nutrient
16%
bioreactor
16%
anion
16%
rate
15%
biofuel
15%
effect
15%
surface water
15%
acidity
14%
soil chemistry
14%
drainage water
13%
sewage
13%
water
13%
sulfate (ester)
12%
acidification
12%
forest ecosystem
12%
wetland
12%
Engineering & Materials Science
Watersheds
61%
Tile
59%
Nitrates
59%
Soils
48%
Rivers
40%
Fertilizers
24%
Organic carbon
22%
Denitrification
21%
Wetlands
21%
Surface waters
20%
Nutrients
19%
Sulfur
19%
Crops
17%
Fluxes
15%
Biological materials
14%
Leaching
14%
Sulfates
14%
Water
13%
Nitrogen fertilizers
12%
Effluents
12%
Acids
11%
Sewage
11%
Chlorophyll
11%
Minerals
10%
Water quality
9%
Biomass
9%
Biofuels
8%
Positive ions
8%
Agriculture
7%
Hydrology
7%
Greenhouse gases
7%
Gas emissions
6%
Groundwater
6%
Seepage
6%
Negative ions
5%
Nitrogen removal
5%