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Soil acidity, available phosphorus content, and optimal biochar and nitrogen fertilizer application rates: A five-year field trial in upland red soil, China

BiogeochemistryEngineeringEnvironmental EngineeringSoil ChemistryAgricultural EconomicsPublic HealthSoil FertilityAvailable Phosphorus ContentOptimal BiocharSoil AciditySoil Fertility ManagementNutrient Management