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Four years of conservation agriculture affects topsoil aggregate-associated 15nitrogen but not the 15nitrogen use efficiency by wheat in a semi-arid climate

Semi-arid ClimateTopsoil Aggregate-associated 15NitrogenLand UseCropping SystemSustainable AgricultureAgricultural EconomicsNatural Resource ManagementSustainable Crop ProductionCrop YieldConservation AgricultureAgriculturePublic HealthSocial Sciences