Weed dynamics of direct seeded basmati rice (Oryza sativa) influenced by different herbicides and their tank-mix applications

Abstract

A farm trial was conducted during the kharif season of 2013 at Chaudhary Charan Singh Haryana Agricultural University, Regional Research Station, Karnal, India to evaluate the efficiency of tank-mix application of bispyribac sodium with pyrazosulfuron, azimsulfuron or ethoxysulfuron after pendimethalin for control of complex weed flora on direct seeded basmati rice (Oryza sativa L.) with twenty treatments laid out in randomized block design with three replications. Among herbicidal treatments application of Pendimethalin 1000 g/ha (PRE) fb tank-mix combination of bispyribac-sodium 25 g/ha with pyrazosulfuron 25 g/ha or azimsulfuron 20 g/ha or ethoxysulfuron 18.0-37.5 g/ha (WCE at 40 DAS: 95.0-96.6%) were realized to be the best herbicidal combinations for control of complex weed flora in direct seeded rice, with significant improvement in total number of tillers at 40 DAS; (53.0-55.7 No./meter row length (m.r.l.), grain yield (4.01-4.10 t/ha), net returns (rupees 108856-113485/ha) and B-C ratio (2.45-2.53) as compared to weedy check (30.6 No/m.r.l., 1.52 t/ha, rupees 1590/ ha and 1.02, respectively).