AGRICULTURAL SCIENCES AND BIOTECHNOLOGY 7 CROP PRODUCTION 6 SMALL FARMS 6 SOCIOECONOMIC ENVIRONMENT 6 CULTIVATION 5 MAIZE 5 PLANT BREEDING 5 PRICES 5 PRODUCTION FACTORS 5 SEED PRODUCTION 5 CROP MANAGEMENT 4 CROPPING SYSTEMS 4 DIFFUSION OF RESEARCH 4 ECONOMIC VIABILITY 4 ENVIRONMENT 4 FERTILIZER APPLICATION 4 INPUT OUTPUT ANALYSIS 4 LAND USE 4 MARKETING POLICIES 4 PEST RESISTANCE 4 SEED INDUSTRY 4 TECHNOLOGY TRANSFER 4 VARIETIES 4 food security 4 CREDIT POLICIES 3 CROPPING PATTERNS 3 DATOS ESTADISTICOS 3 DEMOGRAPHY 3 DEVELOPMENT POLICIES 3 DONNEE STATISTIQUE 3