Sustainable agriculture 71 Agriculture 26 Sustainable Agriculture 13 Organic farming 11 Sustainable development 10 Food supply 9 SUSTAINABLE AGRICULTURE 9 Natural resources 7 Agricultural economics 6 Biodiversity 6 Agricultural Economics 5 Biofertilizers 5 Biotechnology 5 Economics 5 Food industry and trade 5 Food security 5 Soil management 5 Sustainability 5 Climatic changes 4 Globalization 4 Agriculture- environmental aspects 3 Agroforestry 3 Allelopathy 3 Alternative agriculture 3 BIOFERTILIZERS 3 Climate change 3 Environmental aspects 3 Environmental protection 3 Humus 3 Natural Resource Economics, (New March 2000) 3