Fate of 14C‐carbofuran in soils

Abstract

AbstractThe degradation of14 C‐Carbofuran was studied in sterilized, unsterilized and green manure amended clay soil under moist and flooded conditions overa period of 30 days. The14 C mass balance showed that carbofuran did not undergo any degradation in sterilized moist soil. In sterilized flooded soil bound residues were formed to the extent of about 47% of the applied radioactivity at the end of 30 days. Carbofuran underwent considerable degradation in unsterilized moist and flooded soils. In moist soil about 48% of the applied14 C activity was recovered as bound activity while in flooded soil, about 23% of the activity was bound. Green manure amendment resulted in formation of more bound residues under moist conditions while it enhanced the degradation of carbofuran under flooded conditions. In flooded amended soil about 44% of the appliedl4 C‐activity was recovered as against about 54% in the unamended flooded soil. The notable degradation products formed under flooded soil conditions were 3‐keto carbofuran and 3‐hydroxy carbofuran.