Effect of biochar amendment and ageing on Sorption and Degradation of three Carbamate Pesticides in Soils

AUTHOR(S):

O.P.Bansal

TITLE

Effect of biochar amendment and ageing on Sorption and Degradation of three Carbamate Pesticides in Soils

ABSTRACT

Biochar land application is commonly assumed to be an effective way to improve soil fertility. Biochar amendment can alter soil physico-chemical properties, sorption, degradation and leaching of different chemicals. The objectives of this study were to determine the sorption, persistence and mobility of three carbamate pesticides in six different soils in 1, 2, 5% (w/w) biochar amended and 2% aged (4 months) biochar amended soils. By the addition of biochar as compared to control, the sorption of three carbamate pesticides on all the studied soils increased significantly; the enhancement in sorption was directly correlated with amount of biochar added. The increase in pesticide sorption in biochar amended soils may be due to availability of sorption sites on biochar and the presence of micro pores in biochar. However, the sorption retards in aged biochar amended soils which might be due to covering of micro pores by organic and inorganic substances and oxidation of functional groups on the biochar surface. The sorption of three carbamate pesticides on all the studied soils belongs to ‘L type’. The low heat of sorption (<50 kJ mole-1) indicates that the sorption of pesticides was primarily via physical process in to soil organic matter. The degradation of the pesticides during the study obeys first order kinetics; the biochar retards the degradation of the pesticides and the degradation was more inhibited in fresh biochar amended soils than in aged biochar amended. The DT50 (50% dissipated) for three carbamate pesticides was in the order II > I > III denoting that pesticide III is most stable followed by I and II. The relatively strong and quick soil sorption of the carbamate pesticides in biochar amended soils accounts for limited soil leaching of the pesticides. These results indicate that the amendment of fresh biochar retards the degradation of carbamate pesticides, while this effect is retarded in aged biochar amended soils.

KEYWORDS

Biochar, biochar ageing, Carbamate pesticides, sorption, degradation, leaching

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Cite this paper

O.P.Bansal. (2018) Effect of biochar amendment and ageing on Sorption and Degradation of three Carbamate Pesticides in Soils. International Journal of Agricultural Science, 3, 40-53