[HUMIFICATION OF C14-LABELED MICROORGANISMS IN THE SOIL].
D001230:Aspergillus; D001395:Azotobacter; D002118:Calcium; D002136:Calcium, Dietary; D002247:Carbon Isotopes; D002845:Chromatography; D006812:Humic Substances; D012106:Research; D012987:Soil; D012988:Soil Microbiology
D002136:Calcium, Dietary; D002247:Carbon Isotopes; D006812:Humic Substances; D012987:Soil; D002118:Calcium
ASPERGILLUS; AZOTOBACTER; CALCIUM; CARBON ISOTOPES; CHROMATOGRAPHY; EXPERIMENTAL LAB STUDY; HUMIC ACIDS; SOIL MICROBIOLOGY