Vol. 17 No. 2
Bio-efficacy and phytotoxicity of GPH 315 (glufosinate + oxyfluorfen) on weeds of tea
Author(s): S. KUMAR, N. SHARMA, S. MANUJA AND T. BHALLA
Abstract: A field experiment was carried out in the established tea orchard located in Panchrukhi block of Kangra district of Himachal Pradesh during kharif seasons of 2018 and 2019 with the objective of evaluating the bio-efficacy and phytotoxicity of a new herbicide combination product GPH 315 containing glufosinate ammonium and oxyfluorfen in tea (Camellia sinensis). The treatments consisted of different doses of this new combination product as well as other herbicides recommended in tea along with standard checks and were tested in randomized block design (RBD) with three replications. Cynodon dactylon, Digitaria sanguinalis, Ageratum conyziodes, Bidens pilosa, Commelina benghalensis and Cyperus rotundus were the major weed species infesting the tea crop during the period of investigation. Application of this combination product GPH 315 @490 + 175 g a.i.ha-1, was statistically similar to the lower dose of 420 + 150 g a.i. ha-1, resulted in significantly lower total weed count as well as total weed dry weight as compared to all other weed control treatments at all the stages of observation. Significantly highest green leaf yield during both the years was obtained in hand weeding treatment though this treatment was statistically similar with the two higher doses of the combination product GPH 315 (490 + 175 g a.i. ha-1and 420 + 150 g a.i. ha-1). No phytotoxic symptoms were observed on tea at any of the doses of GPH 315 and hence this new combination product can be safely used for the effective control of weeds in tea.
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