SUBJECT
Cropping systems
Agriculture
12
Economic aspects
10
Rice
8
Companion crops
5
Corn
5
Agricultural innovations
4
Crops
4
Research
4
Soils
4
Irrigation
3
Irrigation farming
3
Legumes
3
Philippines
3
Study and teaching
3
Congresses
2
Cultivation
2
Electronic books
2
Evaluation
2
Fertilizers
2
Growth
2
Maize
2
Rural development
2
Soil management
2
Sustainable agriculture
2
Technology transfer
2
Vegetables
2
Weed control research
2
Weeds
2
Agricultural credit
1
Agricultural education
1
Agricultural laborers
1
Agricultural physics
1
Agricultural productivity
1
Agricultural research
1
Agricultural systems
1
Agriculture, Cooperative
1
Agroforestry
1
Agroforestry -- Handbooks, manuals, etc
1
Alternative agriculture
1
Beans
1
Bibliography
1
Bicol
1
Biological control
1
Cabbage
1
Community development
1
Cropping systems Michigan
1
Crops- -Production
1
Data bases
1
Diseases and pests
1
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