Bio-efficacy of pre and post-emergent herbicides with or without inter-cultivation on sunflower (Helianthus annuus L.) in Northern transition tract of Karnataka

Abstract

A field experiment was replicated thrice in randomised complete block design on vertisols at the Main Agricultural Research Station, University of Agricultural Sciences, Dharwad during late kharif 2018 to study the bio-efficacy of pre and post-emergent herbicides with or without inter-cultivation (IC) on sunflower. Significantly higher seed yield (q ha-1), weed control efficiency at 60 DAS (%) and net returns (₹ ha-1) recorded with the application of Pendimethalin 38.7 CS @ 750 g a.i. ha-1 - PE fb IC at 35 DAS (20.7, 93.62 and 43074, respectively) compared toFarmers practice (19.5, 91.43 and 34193, respectively). However, it was on par with Pendimethalin 30 EC @ 1000 g a.i. ha-1 - PE fb IC at 35 DAS, Sulfentrazone 48 SC @ 192 g a.i. ha-1 - PE fb IC at 35 DAS, Quizalofop-p-ethyl 5 EC @ 75 g a.i. ha-1 - POE fb IC at 35 DAS, Propaquizafop 10 EC @ 75 g a.i. ha-1 - POE fb IC at 35 DAS and Fenoxaprop-p-ethyl 9.3 EC @ 50 g a.i. ha-1 - POE fb IC at 35 DAS.