Agriculture 439 Economic aspects 160 Forests and forestry 152 History 144 Soils 96 Agricultural innovations 77 Research 77 more ... Forest management 72 Forest policy 70 Social aspects 68 Hunting 66 Agricultural extension work 50 Agriculture and state 48 Fisheries 42 Irrigation 41 Management 39 Sustainable agriculture 38 Agricultural geography 37 Field crops 37 Agricultural productivity 36 Fertilizers 36 Livestock 33 Citizen participation 30 Rural development 30 Soil conservation 30 Forest conservation 29 Social forestry programs 29 Economic conditions 28 Environmental aspects 28 Music 28 less ...