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Africa Agricultural development Agricultural policies Agricultural research Agriculture Agronomic characters America Asia Barley Biotechnology Breeding Breeding methods Cereals Crop husbandry Crop management Crop yield Cropping systems Crops Crossbreeding Cultivation Developing Countries Disease control Disease resistance Drought resistance Economic analysis Economic plants Economics Environmental factors Evaluation Extension activities Farmers Farming systems Fertilizer application Fertilizers Food production Food security Fungi Genetic resources Genetic variation Genetics Genotypes Germplasm Glumiflorae Grain crops Gramineae High yielding varieties Hybrids India Injurious factors Innovation adoption Irrigation Maize Methods Models Monocotyledons México Natural resources Nitrogen fertilizers Pest control Pest resistance Pests of plants Plant breeding Plant developmental stages Plant diseases Plant genetics and breeding Plant physiology Plant production Plant products Plants Production Production factors Quality Research Research institutions AGROVOC Research policies Research projects Resistance to injurious factors Resource conservation Rice Rusts Seed production Selection Soil fertility Statistical analysis Technology transfer Training Trials Triticales Triticum Triticum aestivum AGROVOC Tropical zones USA Varieties Weed control Wheat Wheat triticum spp. Wheats AGROVOC Yields Zea mays Zea mays AGROVOC