National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The use of herbicides in rice may affect the soil’s biological equilibrium and thus influences its nutrient status, health and productivity. To know about the effect of herbicides on soil microbial populations in rice, a field experiment was conducted at Palampur during kharif 2016 and 2017. Ten treatments, comprised of company released sample of pyrazosulfuron-ethyl 10% WP at 10, 15, 20 and 30 g ai/ha was compared to market sample at 10 and 15 g/ha, bispyribac- sodium at 20 and 40 g/ha, hand weeding twice and weedy check on a silty clay loam soil. The prevalence of Echinochloa crusgalli, E. colona, Cyperus difformis, C. iria, and Ammannia baccifera were the major weeds associated with rice crop. The results revealed great influence of different doses of pre-emergence (PE) pyrazosulfuron-ethyl 10% WP on the population of total bacteria, fungi and actinomycetes initially after 5th day of its application (9 DAT). Pyrazosulfuron-ethyl 10% WP at 30 g ai/ha exerted maximum reduction in bacterial, fungal and actinomycetes population in the tune of 20.86, 26.39 and 14.12%, respectively. Post-emergence (POE) bispyribac sodium 40 g/ha was found to reduce the population of bacteria, fungi and actinomycetes by 21.28, 28.81 and 15.29%, respectively, after 5 days of herbicide application (30 DAT). The market sample of pyrazosulfuron-ethyl 10% WP 15 g/ha showed higher reduction on 5 days after spray over the company sample. The population of microorganisms under observation was recovered from initial herbicide impact on 15 days after their spray. Pyrazosulfuron 30 g/ha remaining at par with pyrazosulfuron 20 g/ha gave significantly higher yield of rice over other weed control treatments.
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