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 |
An experiment was conducted at Gurjangjhora Tea Estate, Malbazar, Jalpaiguri during kharif seasons of 2013 and 2014 to find out the efficacy of non-selective ammonium salt of glyphosate 71% SG on weed dynamics in tea and its effect on soil microflora. The experiment was laid out in randomized block design and replicated thrice. The treatment comprised of seven herbicidal treatments viz. ammonium salt of glyphosate 710, 1420, 2130 g a.i. ha-1, standard glyphosate 2130 g a.i. ha-1 and paraquat dichloride 2130 g a.i. ha-1, HW at 20 and 40 days after application besides weedy check. Both the weed density and biomass at 40 and 60 days after application of all the weed control treatments were significantly lower than weedy check. Ammonium salt of glyphosate (71% SG) 2130 g ha-1 proved significantly better for controlling the major pre-dominant tea weed i.e. Cyperus rotundus and Borreria hispida. The higher WCE (90.28%) was recorded under hand-weeding and ammonium salt of glyphosate (71% SG) 2130 g ha-1 (89.10%) at 60 DAS followed by its lower doses. The resurgence of weed flora was observed after two months of application. Herbicides did not show any phytotoxicity symptoms on the matured tea plants throughout the observation period. The herbicidal treatments showed initial detrimental effect on soil microbial (total bacteria, fungi and actinomycetes) population, but no harmful effects were recorded after one month of application.
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