Agriculture & Biology
cotton
45%
Gossypium hirsutum
39%
nitrogen fertilizers
23%
lint cotton
16%
soil
16%
highlands
15%
nitrates
13%
nutrient uptake
13%
nitrogen
12%
lint yield
12%
irrigation
11%
Gossypium barbadense
11%
furrows
11%
Trifolium vesiculosum
11%
petioles
11%
potassium
10%
deserts
10%
soil transport processes
10%
irrigation water
10%
nutrient partitioning
10%
desert soils
10%
solutes
10%
Sonoran Desert
9%
fulvic acids
9%
soil analysis
9%
crops
8%
soil profiles
8%
planting
8%
plant analysis
8%
humic acids
8%
production technology
7%
volatilization
7%
cultivars
7%
leaching
7%
hydroxyapatite
7%
uptake mechanisms
7%
bromides
7%
Chile
6%
leaves
6%
soil fertility
6%
tannins
6%
fertilizers
6%
growing season
6%
plant exploration and collection
5%
phosphorus
5%
heat
5%
stems
5%
ammonium sulfate
5%
bolls
5%
Earth & Environmental Sciences
cotton
42%
fertilizer
23%
irrigation
12%
potassium
12%
soil
12%
production system
11%
nitrate
11%
nitrogen
10%
evaluation
9%
desert soil
9%
crop
9%
nutrient uptake
8%
cultivar
8%
nitrogen isotope
7%
fulvic acid
7%
soil test
7%
forage
7%
algal bloom
7%
bromide
7%
volatilization
7%
fertility
7%
humic acid
6%
rate
6%
nutrient
6%
desert
6%
solute
5%
phosphorus
5%
drip irrigation
5%
pest control
5%
sandy loam
5%
experiment
5%
Engineering & Materials Science
Cotton
100%
Crops
33%
Irrigation
16%
Soil conditioners
13%
Fertilizers
10%
Nitrogen
8%
Nitrates
8%
Economic analysis
7%
Calcium
7%
Scheduling
5%