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2 Savanna history economy and background
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agricultural amount annual rainfall average cassava cent clay climatic cotton cowpea cultivars cultivation density diseases dry matter dry season effect energy equation evaporation evapotranspiration fallow farmers farming systems Ferrallitic soils Ferruginous soils grain grass groundnut growing season grown growth harvested humid humus improved increase irrigation isohyet Kassam kg/ha Kowal labour land latitude leaching leaf losses lower maize millet Nigeria nitrogen Northern Guinea Savanna nutrients organic matter pests phosphate photosynthesis plant population potential radiation rains rainy period rainy season range rice ridges root run-off Sahel Samaru Savanna areas Savanna region Savanna soils seed Senegal soil erosion soil fertility soil moisture soil profile soil water sole crop sorghum southern sowing sown species storage Sudan region Sudan Savanna surface temperature tion tonne/ha tropics tubers values vegetation Vertisols village water budget West Africa West African Savanna wet season yams Zaria