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Academic JournalsSoil Organic MatterSoil Chemical PropertiesSoil SamplesSoil PropertiesCrop ProductionSoil Organic CarbonRock PhosphateTropical SoilsCation Exchange CapacityWater Holding CapacitySoil Moisture ContentSandy Clay LoamSoil ManagementComplete Block DesignAspergillus NigerSubmerged FermentationSoil PHOrganic MatterSoil Moisture