Abstract
Soil amendments play an important role in management of pesticide residues. In this study, incubation experiment was conducted using the surface (0 - 15 cm) sample of a mollisol supplied with different soil amendments (farmyard manure, cow-dung slurry, pyrite and gypsum) to investigate the effect of amendments on the dissipation of lindane in mollisols. Dissipation of lindane in soil was studied at eight consecutive samplings (0, 1, 3, 5, 7, 10, 15 and 30 d). The results indicated that soil amendments could promote the degradation of lindane in soil. After 30 d of incubation 79% degradation was observed in the untreated soil (without any amendment) whereas, in the case of farmyard manure and cow-dung slurry amended soils, 83% and 91% degradation was observed, respectively. The pyrite and gypsum amendments also enhanced the degradation of lindane in soils, but the effect was less pronounced as compared to the organic amendments. Enhanced degradation in soil treated with organic amendments could be attributed to stimulated microbial activity after the addition of organic amendments. These addition, under different soil management conditions, minimize the persistence of lindane and consequently the risk of leaching and seepage into aquifers.
Highlights
Lindane, the ‘γ’ isomer of hexachlorocyclohexane, is an organochlorine compound primarily used as an insecticide and fumigant against a wide range of soil dwelling and phytophagous insects
The results indicated that soil amendments could promote the degradation of lindane in soil
Soil acts like an active filter, where pesticides are degraded by chemical, physical and biological means
Summary
The ‘γ’ isomer of hexachlorocyclohexane (γHCH), is an organochlorine compound primarily used as an insecticide and fumigant against a wide range of soil dwelling and phytophagous insects. Agricultural uses are mainly responsible for the persistence of lindane residue in soil. Due to its continuous use and indiscriminate industrial production, lindane contaminated soils are widespread in the country. Application of soil amendments has been a common agronomic practice followed in agriculture to increase the soil fertility and crop productivity. Soil amendments play an important role in the management of pesticides residues in agricultural fields. Lindane exerts adverse impacts on the environment, it is critically important to develop different methods to enhance it’s degradation in polluted fields. These cost effective tools can help farmers to modify their farming practices and preserve soil and water quality. A laboratory investigation was, planned to evaluate different soil amendments for their efficacy to dissipate lindane in a mollisol
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