Landbrug og biologi
flood irrigation
87%
Vietnam
66%
paddies
63%
nitrogen fertilizers
58%
drying
49%
water management
31%
dry season
25%
ammonia
23%
nitrification
21%
irrigation
21%
volatilization
21%
topsoil
20%
delta soils
16%
soil horizons
12%
alluvial soils
12%
rice
12%
denitrification
11%
aboveground biomass
9%
mineralization
9%
soil pH
8%
crop yield
8%
production technology
7%
grain yield
7%
urea
7%
fertilizers
6%
crops
4%
soil
4%
Geo- og miljøvidenskab
paddy field
68%
wetting
62%
fertilizer
55%
drying
53%
flooding
50%
nitrogen
38%
dry season
22%
water management
20%
irrigation
18%
volatilization
17%
topsoil
15%
effect
14%
nitrification
14%
rice
14%
ammonia
12%
loss
12%
soil
10%
soil horizon
9%
aboveground biomass
8%
crop yield
8%
production system
8%
urea
8%
management practice
7%
harvest
7%
denitrification
7%
field experiment
7%
mineralization
5%
fold
5%
crop
5%
parameter
2%
Medicin og biovidenskab
Fertilizers
100%
Vietnam
76%
Oryza
76%
Nitrogen
63%
Soil
52%
Nitrification
29%
Volatilization
21%
Ammonia
18%
Water
16%
Denitrification
13%
Biomass
9%
Practice Management
9%
Urea
7%