Chemical weed management in hybrid cotton under southern dry zone of Karnataka

Abstract

A field experiment was conducted during Kharif season of 2015 & 2016 at Krishi Vignana Kendra Haradanahalli, Chamarajanagara, Karnataka to study the efficacy of herbicide for controlling weeds in hybrid Cotton. The trial was comprised of three herbicides viz., pendimethalin (38.75 EC) at 0.75 kg a.i.ha-1, Tank mixture of pyrithiobac sodium (10 SC) @ 62.5 g a.i.ha-1 + quizolofop ethyl (5 EC) @ 37.5 g a.i.ha-1, pendimethalin (38.75 EC) @ 0.75 kg a.i.ha-1, followed by Glyphosate (41% SL) @ 1.0 kg a.i.ha-1, were compared with weed free and weedy check and laid out in randomized complete block design and replicated four times. The results revealed that, tank mixture of pyrithiobac sodium (10 SC) @ 62.5 g a.i.ha-1 + quizolofop ethyl (5 EC) @ 37.5 g a.i.ha-1 at 2 to 4 leaf stages of weeds recorded higher weed index (16.6%), net monetary returns (48500/- Rs./ha) and returns per rupees spent (Rs.12.54) with kapas yield of 1702 Kg/ha as compare to other herbicides.