Abstract
The use of herbicides has been questioned in recent past for their non-target effects. Therefore, we planned to study the effect of pretilachlor on growth and activities of microbes in tropical rice soil under controlled condition at National Rice Research Institute, Cuttack, India. Three pretilachlor treatments, namely, recommended dose at 600 g a.i. ha−1 (RD), double the recommended dose at 1200 g a.i. ha−1 (2RD), and ten times of the recommended dose at 6000 g a.i. ha−1 (10RD) along with control, were imposed. The initial residue (after 2 h of spray) deposits in soil were 0.174, 0.968, and 3.35 μg g−1 for recommended, double the recommended, and ten times of the recommended doses, respectively. No residue in soil was detected in RD treatment on day 45. The half life values were 16.90, 17.76, and 36.47 days for RD, 2RD, and 10RD treatments, respectively. Application of pretilachlor at 10RD, in general, had significantly reduced the number of bacteria, actinomycetes, fungi, nitrogen fixers, and microbial biomass carbon. Pretilachlor at RD did not record any significant changes in microbial properties compared to control. The results of the present study thus indicated that pretilachlor at RD can be safely used for controlling grassy weeds in rice fields.
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Authors duly acknowledge the technical and financial support provided by the Director, ICAR-National Rice Research Institute, Cuttack.
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Sahoo, S., Adak, T., Bagchi, T.B. et al. Non-target effects of pretilachlor on microbial properties in tropical rice soil. Environ Sci Pollut Res 23, 7595–7602 (2016). https://doi.org/10.1007/s11356-015-6026-x
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DOI: https://doi.org/10.1007/s11356-015-6026-x