Vol. 12, Issue 7 (2023)

Author(s):
PS Panchal, VJ Patel, AD Kalola, HD Rahevar and NM Vasava

Abstract:
To study the efficacy and phytotoxicity of herbicide mixture on weeds and Bt. cotton in loamy sand soils of middle Gujarat, a field trial was carried out at the farm of AICRP-Weed Management, B. A. College of Agriculture, Anand Agricultural University, Anand, Gujarat during two consecutive kharif season of the year 2019 and 2020. Results revealed that pre-emergence application of pendimethalin (38.7% CS) 500 g/ha + oxyfluorfen 50 g/ha as (tank mix) fbpost-emergence application of pyrithiobac-sodium 62.5 g/ha + quizalofop-ethyl 50 g/ha (tank mix), sequential application of oxyfluorfen 100 g/ha as PE fb glufosinate ammonium 375 g/ha directed spray as PoE and IC + HW at 20, 40 and 60 DAS recorded significantly lower weed dry weight (monocot and dicot weeds) at 30 DAS and at harvest. These three treatments achieved cent percent monocot and dicot weed control efficiency at 30 DAS and resulted in significantly higher comparable seed cotton yield. With regards to phytotoxicity of applied herbicides on crop, none of herbicide caused any injury except oxyfluorfen which showed slight necrosis and epinasty symptoms (10 to 20%) at initial stage on cotton which was recovered in due course of time, but early cotton phytotoxicity had no significant long-term effect on growth and yield of Bt. Cotton.