Author(s): S. Banerjee, R. Kundu, S. Bera and C. Soren

Abstract: An experiment was conducted at Kamalpur Tea Estate, Birpara, Jalpaiguri, West Bengal during kharif season of 2016 and 2017 to evaluate the bio-efficacy and phytotoxicity of glufosinate ammonium 13.5% SL in tea (Camellia sinensis L.). The experiment was laid out in a randomized block design (RBD) with six treatments and four replications. Axonopus compressus; Eleusine indica; Digitaria sanguinalis; Cyperus aromaticus; Ageratum conyzoides; Borreria hispida; Commelina benghalensis; Scoparia dulcis, Mikania micrantha, Leucas cephalotes and Lindernia crustacean were the major weeds found infesting the tea crop during experimentation. The weed flora in tea were controlled effectively by applying glufosinate ammonium 13.5% SL at dosages varied from 375 g a.i. ha^-1 to 625g a.i. ha^-1 along with paraquat dichloride 24% SL @ 1 kg ha-1, which were statistically superior to weedy check. Significant increase in total leaf yield of tea was obtained by application of glufosinate ammonium 13.5% SL at the tested dose ranging from 375 g a.i. ha^-1 to 625g a.i. ha^-1, in comparison to the weedy check and standard check. No phytotoxicity symptoms were observed in any of the doses of glufosinate ammonium 13.5% SL and hence, effective weed management can be done with the use of test herbicide.

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