SUBJECT
Fertilizers and manures
Nitrogen fertilizers
Rice
11
Sorghum
2
Soybean
2
Agriculture
1
Ambary hemp
1
Ammonia as fertilizers
1
Companion crops
1
Dry farming
1
Grasses
1
Harvesting
1
Irrigation
1
Jute
1
Legumes
1
Mung bean
1
PLant populations
1
Phosphatic fertilizers
1
Plant spacing
1
Planting
1
Rice research
1
Rotation of crops
1
Soil moisture
1
Sweet potatoes
1
Urea as fertilizers
1