Agriculture & Biology
potatoes
89%
nitrogen
85%
Urochloa ruziziensis
74%
beans
74%
tubers
64%
soil
46%
tropical soils
40%
grain yield
40%
leaves
34%
urea
33%
nitrogen fertilizers
31%
ammonium sulfate
30%
sandy soils
30%
Urochloa
30%
nitrates
28%
nutrition
28%
crops
27%
nutrients
27%
Brazil
27%
Crambe (Esperiopsidae)
27%
corn
26%
biomass production
26%
Brachiaria
25%
shoots
24%
phosphates
24%
dicyandiamide
24%
nitrification
24%
nutrient uptake
24%
Rhizobium tropici
21%
no-tillage
21%
sowing
21%
seed yield
20%
nitrification inhibitors
20%
plant density
20%
double cropping
19%
ammonium nitrate
19%
tropics
19%
reactive nitrogen species
18%
cultivars
18%
Carthamus tinctorius
18%
Oxisols
17%
plant nitrogen content
17%
plant analysis
17%
cropping systems
16%
potato starch
16%
grain quality
16%
nutrient use efficiency
15%
phosphorus
15%
Earth & Environmental Sciences
potato
100%
nitrogen
71%
urea
53%
tuber
52%
inhibitor
46%
nitrification
42%
dry matter
32%
soil
31%
sowing
30%
nitrate
27%
cultivar
26%
maize
25%
phosphate
25%
zero tillage
24%
loss
22%
leaching
22%
nutrient
21%
nitrous oxide
21%
crop
20%
rhizobacterium
19%
Oxisol
18%
nutrition
18%
nutrient uptake
18%
tropical soil
17%
production system
17%
ammonium nitrate
16%
ammonium sulfate
16%
nutrient removal
16%
inoculation
16%
cropping practice
15%
sandy soil
14%
rate
14%
growing season
14%
fertilizer
13%
phosphorus
13%
tropics
13%
additive
12%
effect
12%
grass
12%
microorganism
10%
dose
10%
forage
9%
seed
8%
biomass
7%
nodulation
7%
monitoring
7%
modeling
5%
Medicine & Life Sciences
Brachiaria
88%
Nitrogen
66%
Zea mays
53%
Fertilization
49%
Soil
40%
Solanum tuberosum
37%
Urea
31%
Rhizobium tropici
30%
Nitrification
27%
dicyandiamido
26%
Fertilizers
22%
Rhizobium
21%
Nitrates
20%
Poaceae
20%
ammonium nitrate
19%
Nitrous Oxide
19%
Reactive Nitrogen Species
18%
Ammonium Sulfate
18%
Minerals
16%
Digitaria
12%
Phaseolus
11%
Biomass
10%
Temperature
10%
Ipomoea
10%
Seeds
9%
Growth
8%
Phosphates
7%
Cenchrus
6%
Allelopathy
5%