SUBJECT
Agriculture
5
Multiple cropping
3
Rice and rice culture
3
Poultry
2
Rice
2
Agricultural chemistry
1
Agricultural colleges
1
Agricultural extension work
1
Beans
1
Cabbage
1
Cadang-cadang
1
Catalogs, College
1
Corn
1
Dissertations, Academic
1
Farm management
1
Farm management research
1
Horticulture
1
Irrigation
1
Maize
1
Peas
1
Research
1
Seeds
1
Soil science
1
Stock and stock-breeding
1
Stock and stockbreeding
1
Sugar-cane
1
Tobacco
1
Vegetables
1
Wheat
1