Abstract
Plant species, viz Cleistanthus collinus, Lantana camara, and Strychnos nux-vomica are being traditionally used for pest management in rice. However, limited investigation has been carried out to understand the toxic effect of these materials on soil microbes. Hot water extracts of these plants were evaluated for their effects on soil microbial population and enzyme activities along with neem oil and chlorpyrifos as check. Soil microbial population, viz bacteria, fungi, phosphate-solubilizing bacteria (PSB), and asymbiotic nitrogen fixers were unchanged after application of plant extracts. Maximum population of bacteria including PSB and asymbiotic nitrogen fixers were observed in control, whereas, S. nux-vomica, and C. collinus–treated soil had higher number of actinomycetes and fungal population, respectively. Soil microbial biomass did not vary differently among the plant extracts. Application of plant extracts did not alter dehydrogenase, β-glycosidase, acid phosphatase, alkaline phosphatase, and urease content in soil. Secondary metabolites present in these plant extracts may be responsible for variable effects on soil microbes. Chlorpyrifos had a fleeting negative effect on soil microbes and enzymes in comparison to plant extracts. All the three plants did not have any negative effect on soil microbes and enzymes and can be safely recommended in rice pest management.
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Authors duly acknowledge the financial support provided by the Director, ICAR-National Rice Research Institute, Cuttack under ICAR-NRRI/In-house project 3.5/2012-2017 scheme (Fund received by Dr. Totan Adak).
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Mishra, T., Govindharaj, GPP., Gadratagi, B.G. et al. Deciphering the associated risk on soil microbes upon use of biopesticides in rice ecosystem. Environ Monit Assess 191, 654 (2019). https://doi.org/10.1007/s10661-019-7823-3
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DOI: https://doi.org/10.1007/s10661-019-7823-3