Bio-efficacy and phyto-toxicity of post-emergence herbicides tank mixtures on soybean (Glycine max L. Merrill)

Abstract

The field experiment was replicated thrice in randomised complete block design at Main Agricutural Research Station, Dharwad during kharif 2018 to study the bio-effiacy and phyto-toxicity of post-emergence herbicides tank mixtures on soybean (Glycine max L. Merrill). Application of Imazethapyr 75 g ha-1 + Quizalofop-p-ethyl 37.50 g ha-1 (75% RD) recorded significantly lower weed density (6.67 and 8.67 m-2 at 40 and 60 DAS, respectively), total weed dry weight (1.90 and 2.73 g m-2 at 40 and 60 DAS, respectively), and weed index (11.98%) with significantly higher weed control efficiency (77.75 and 85.79% at 40 and 60 DAS, respectively) seed yield and net returns (2,554 kg ha-1, ₹ 59,111 ha-1, respectively) over Imazethapyr alone. It was at par with RWMP (2,652 kg ha-1, ₹ 62,111 ha-1, respectively) and Imazethapyr 75 g ha-1 + Propaquizafop ethyl 75 g ha-1 (2,356 kg ha-1, ₹ 50,791 ha-1, respectively). There was.broad spectrum weed control through herbicide tank mixtures compared to Imazethapyr alone. Phytotoxicity was not observed due to tank mixtures of herbicides.