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Long-term effects of potassium fertilization and straw return on soil potassium levels and crop yields in north-central China

BiogeochemistryEngineeringPlant-soil RelationshipSustainable AgricultureAgricultural EconomicsPlant NutritionPotassium FertilizationPublic HealthSoil FertilityStraw ReturnSoil Potassium LevelsNutrient Management