1980 · 11 citations · 0 references
AgricultureAgronomySoil SciencesCrop ProductionCropping SystemsSoil FertilityAgricultural Production SystemsCrop NutritionSoil Fertility DynamicsSoil Fertility EvaluationSoil Fertility MaintenanceSoil Fertility ManagementCrop Response To FertilityCrop YieldsSeed UtilizationSoil Fertility PotentialVery Low Fertility Soils