Agriculture & Biology
leys
70%
animal manures
52%
nitrogen fertilizers
49%
grasses
40%
slurries
34%
meta-analysis
31%
soil fertility
30%
crops
26%
grasslands
23%
ammonia
23%
fertilizers
21%
soil organic matter
19%
farms
18%
composts
17%
attainable yield
17%
fertilizer rates
17%
long term experiments
16%
cattle
16%
pig manure
16%
methodology
11%
cattle manure
10%
mineral fertilizers
10%
cover crops
10%
nitrogen
8%
soil quality
7%
winter wheat
7%
root crops
7%
nutrients
6%
assets
6%
biodiversity
6%
corn silage
6%
linear programming
6%
confidence interval
5%
sandy soils
5%
injection
5%
carbon sequestration
5%
nutrient management
5%
greenhouse gas emissions
5%
agricultural soils
5%
organic fertilizers
5%
crop residues
5%
Earth & Environmental Sciences
manure
52%
fertilizer
47%
grass
47%
replacement
44%
nitrogen
38%
meta-analysis
30%
cattle
27%
crop
27%
grassland
22%
ammonia
21%
Europe
18%
long-term experiment
15%
soil organic matter
13%
effect
9%
soil quality
8%
rate
7%
root crop
7%
maize
6%
yield response
6%
silage
6%
tuber
6%
nutrient
5%
mineral fertiliser
5%
savings
5%
soil biodiversity
5%
Engineering & Materials Science
Nitrogen fertilizers
100%
Manures
77%
Fertilizers
70%
Slurries
33%
Ammonia
29%
Soil quality
23%
Crops
21%
Biodiversity
19%
Nitrogen
10%
Dairies
9%
Nutrition
8%
Proteins
6%
Potassium
5%
Phosphorus
5%
Productivity
5%