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The relative roles of N fixation, fertilizer, crop residues and soil in supplying N in multiple cropping systems in a humid, tropical upland cropping system

BiogeochemistryRelative RolesEngineeringCropping SystemsCropping SystemAgricultural EconomicsCrop ResiduesSoil ManagementCrop RotationSoil Nutrient ManagementPublic HealthSoil FertilityN FixationNutrient Management