African Crop Science Journal · 1999 · 23 citations · 0 references
AgricultureAgricultural EconomicsAgronomyCrop ProductionCropping SystemsSoil FertilityAgricultural MarketsAgricultural Production EconomicsAgricultural Production SystemsCrop Production EconomicsSoil Fertility MaintenanceSoil Fertility ManagementBean Crop ProductionCrop Productivity AssessmentCrop YieldsFertilizer Economics