Medicine & Life Sciences
Lettuce
100%
Fertilizers
98%
perchlorate
94%
Chile
76%
Soil
68%
Phosphates
13%
Hazard Analysis and Critical Control Points
12%
Grassland
11%
Atmosphere
9%
Nitrates
8%
Formal Social Control
7%
Nitrogen
7%
Potassium
7%
Earth & Environmental Sciences
perchlorate
79%
crop
45%
nitrogenous fertilizer
36%
fertilizer
27%
soil
26%
agricultural soil
16%
phosphate
12%
fertilizer application
9%
food safety
9%
farming system
8%
soil surface
6%
potassium
6%
grassland
6%
nitrate
5%
regulation
5%
nitrogen
4%
atmosphere
4%
rate
2%
Engineering & Materials Science
Fertilizers
80%
Crops
69%
Soils
49%
Phosphates
18%
Potassium Nitrate
12%
Food safety
10%
Nitrates
9%
Potassium
9%
Precipitates
8%
Deposits
7%
Nitrogen
7%
Chemical Compounds
Perchlorate
57%
Soil
53%
Fertilizer
48%
Nitrogen Fertilizer
40%
Phosphate(3-)
10%
Safety
6%
Nitrate
5%
Food
5%
Phosphate
5%
Environment
4%
Surface
2%
Application
2%