SUBJECT
Soils
Congresses
2
Rice
2
Soil science
2
Analysis
1
Civil engineering
1
Classification
1
Control
1
Dry farming
1
Environmental aspects
1
Fixation
1
Nitrogen
1
Nitrogen content
1
Plant-soil relationships
1
Plants, Effect of nitrogen on
1
Soil mechanics
1
Soil physics
1
Soilborne plant diseases
1
Soilborne plant pathogens
1
Tropics
1