Effect of different herbicides alone and in combination on complex weed flora at early and late stages of direct seeded Basmati rice (Oryza sativa L.)

摘要

A field experiment was carried out during the kharif season of 2013 at Chaudhary Charan Singh Haryana Agricultural University, Regional Research Station, Karnal, India to evaluate the effect of different herbicides as alone and tank-mix on the dynamicand complex weed flora in direct seeded Basmati rice. The experimental field was predominantly infested with Echinochloa crus-galli, Eragrostis tenella, Dactyloctenium aegyptium, Ammannia baccifera and Cyperus rotundus. Pendimethalin 1000 g ha-1 (Pre-emergance) fb tank-mix combination of bispyribac-sodium 25 g ha" 1 with pyrazosulfuron 25 g ha-1 or azimsulfuron 20 g ha-1 or ethoxysulfuron 18.0-37.5 g ha-1 were realized to be the best herbicidal combinations for control of complex weed flora in direct seeded rice, with significant improvement in grain yield (4.05-4.10 t ha-1), net returns (1,08,856-1,13,485 ha"1) and B-C ratio (2.45-2.53) as compared to weedy check.