Agriculture History 221 Economic aspects 90 Environmental aspects 67 Research 58 Histoire 56 Food supply 50 more ... farming (activity or system) 46 Agricultural ecology 44 Agricultural innovations 40 Landwirtschaft 36 Agriculture and state 34 Aspect économique 33 Farm life 33 Aliments 28 Sustainable agriculture 27 Recherche 26 Social aspects 25 Aspect de l'environnement 24 Innovations 22 Organic farming 22 Food 21 Economic conditions 19 Farmers 18 Government policy 18 Country life 17 Écologie agricole 17 Farms 17 Landbouw 17 Soils 17 less ...