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Subject
- Agricultural ecology489
- Agriculture138
- Environmental aspects71
- Sustainable agriculture66
- Economic aspects37
- Agricultural systems29
- History27
- Land use, Rural21
- Organic farming21
- Agriculture and state19
- Ecology19
- Research18
- Agricultural conservation17
- Crops and climate17
- Human ecology17
- Agricultural innovations15
- Agricultural productivity15
- Soils14
- Agricultural pollution13
- Food supply13