Rice -- 9 Planting -- 6 Agricultural innovations -- 3 Coffee -- 3 Agriculture -- 2 Breeding -- 2 Economic aspects -- 2 more ... Fishery products -- 2 Handbooks, manuals, etc. -- 2 Orchid culture -- 2 Orchid industry -- 2 Pepper (Spice) -- 2 Plant products industry -- 2 Rubber -- 2 Tobacco -- 2 Varieties -- 2 Vegetables -- 2 Bee culture -- 1 Buffaloes -- 1 Cacao -- 1 Chemigation 1 Chickens -- 1 Diseases -- 1 Diseases and Pests -- 1 Dissertations 1 Ducks 1 Ducks -- 1 Economic aspects 1 Farms, Small -- 1 Field crops -- 1 less ...