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MAINTENANCE OF SOIL ORGANIC MATTER
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1949
Year
EngineeringLand UseSoil Organic MatterAgricultural EconomicsSoil ManagementSoil ConservationLand ApplicationLand DegradationSoil BiochemistryOrganic GeochemistryIrrigation ManagementAgriculture1 1U. S. DepartmentSustainable AgriculturePublic HealthBiogeochemistryIrrigationSoil TechnologyEnvironmental EngineeringNatural Resource ManagementFarming SystemsSoil Health
U. S. Department of Agriculture1 1 Division of Soil Management and Irrigation, Beltsville, Maryland.