ISSN:
1573-5036
Keywords:
accelerated biodegradation
;
carbofuran
;
mineralization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Kendaia clay loam contained more than 105 microbial cells per g able to convert 14C-carbonyl-labelled carbofuran (2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate) to 14CO2 but never more than 130 cells per g transforming 14C-ring-labelled carbofuran to CO2. The sizes of the population rarely increased as a result of addition of the insecticide to soil. Mineralization of these compounds proceeded with little or no acclimation phase, and subsequent additions were usually etabolized more readily, except at 10 mg of carbofuran per kg or if subsequent additions of the pesticide were made long after the first. More than 60% of the 14C in the carbonyl but less of the 14C in the ring was microbiologically converted to 14CO2 in this soil. Streptomycin and cycloheximide each inhibited conversion of the carbonyl or ring carbon to CO2. Urea but not NH4NO3 markedly inhibited the conversion of the carbonyl-labelled insecticide to 14CO2. The addition of glucose and succinate together with the insecticide did not enhance mineralization of ring- or carbonyl-labelled carbofuran. The data suggest that soils containing a large population of microorganisms able to convert the carbonyl carbon to CO2 will not show a marked effect of prior treatment with the insecticide and that few organisms individually are able to mineralize the ring.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00041374
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