Earth & Environmental Sciences
digester
87%
crop production
86%
soil fertility
85%
biogas
78%
Africa
59%
nutrient
52%
manure
47%
nutrient loss
25%
biochar
21%
loss
21%
compost
20%
anaerobic digestion
19%
nitrogen
17%
pyrolysis
17%
dose
14%
crop
14%
phytotoxicity
12%
sowing
12%
stove
12%
soil amendment
11%
organic waste
10%
soil nutrient
10%
volatilization
10%
composting
10%
immobilization
10%
digestion
9%
growing season
9%
material
8%
leaching
7%
carbon
5%
soil
4%
Agriculture & Biology
Sub-Saharan Africa
90%
biogas
87%
crop production
74%
soil fertility
73%
nutrients
47%
animal manures
42%
biochar
21%
anaerobic digestion
20%
pyrolysis
19%
soil nutrients
18%
composts
17%
nitrogen
15%
organic wastes
10%
soil amendments
10%
volatilization
10%
composting
9%
phytotoxicity
9%
crops
9%
dosage
9%
leaching
8%
sowing
7%
growing season
7%
digestion
6%
carbon
5%
Engineering & Materials Science
Nutrients
100%
Biogas
91%
Crops
88%
Soils
62%
Manures
51%
Nitrogen
20%
Anaerobic digestion
18%
Pyrolysis
13%
Composting
11%
Stoves
9%
Leaching
8%
Vaporization
8%
Animals
7%
Carbon
5%