Sorption, dissipation and enzymatic activity of bispyribac-sodium in rice straw biochar amended soil
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was undertaken to study the effect of rice straw and its biochar amendment on sorption and dissipation of bispyribac-sodium and its effect on soil enzymes and bacterial population. The rice straw biochars were prepared, characterized and investigated for their potential to affect fate of bispyribac-sodium. The adsorption-desorption kinetics of bispyribac-sodium was well described by pseudo second order kinetic model and Freundlich isotherm (R2>0.99). KFads increased from 1.55 to 29.57 μg1−ng−1mln on amendment of soil with URS and biochars. The variation in the adsorption capacity of bispyribac-sodium amongst rice straw and its biochars amended soils was in line with surface area of the amendments. Desorption of bispyribac-sodium decreased on amendment of soil with rice straw and its biochars and it varied from 90.45 to 95.20 and 60.95 to 89.50% in unamended and amended soil, respectively. Adsorption and desorption of bispyribac-sodium varied significantly with the herbicide concentration, amendment type and amendment level of rice straw and its biochars in soil. The half-life of bispyribac-sodium ranged from 23.13 to 28.60 and 7.55 to 18.44 days in unamended and amended soil, respectively and it was inversely related to their adsorption capacity in amended soil. Bispyribac-sodium application and amendment of soil with rice straw and its biochars significantly affected the soil dehydrogenase, alkaline phosphatase activity and bacterial population.
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