MINERALIZATION OF C-14-LABELED RICE STRAW IN AEROBIC AND ANAEROBIC CLAY SOILS AS INFLUENCED BY INSECTICIDE TREATMENTS

The mineralization of C-14-labelled rice straw in a clay soil under aerobic and anaerobic conditions as influenced by hexachlorocyclohexane, carbaryl and carbofuran was studied for 40 days. More mineralization of C-14-labelled rice straw was observed in aerobic than in anaerobic soil. HCH at 10-times field rate concentration only inhibited (CO2)-C-14 evolution in aerobic soil after 3-days incubation. In general, insecticides applied to soil at normal field rates and 10-times field rates had no effect on either the amount of (CO2)-C-14 evolved or C-14-residues remaining in the soil.