Effect of different herbicides on density and dry matter production of major weeds in chickpea (Cicer arietinum L.)

Abstract

A field experiment was conducted in the experimental plots of Instructional cum Research Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur, (C.G.) during rabi season 2019-20. The soil of experimental field was clayey (Vertisols) in texture, which was low, medium and high in available N (223 kg/ha.), P (12.24 kg/ha.) and K (382.6 kg/ha.), respectively. The experiment was laid out in Randomized Block Design with four replications. The treatment of Topramezone 33.6 SC formulation (20.6 g a.i./ha) EPoE at 14 DAS (T1), Topramezone 33.6 SC formulation (20.6 g a.i./ha) EPoE at 21 DAS (T2), Topramezone 33.6 SC formulation (25.7 g a.i./ha) EPoE at 14 DAS (T3), Topramezone 33.6 SC formulation (25.7 g a.i./ha) EPoE at 21 DAS (T4 ), Quizalofop-p-ethyl 5 EC (100 g a.i./ha) PoE at 25 DAS (T5), Pendimethalin 30 EC formulation + Imazethapyr 2% (Ready mix @ 1kg/ha) PE + one Hoeing at 30 DAS (T6), Pendimethalin 30 EC formulation + Imazethapyr 2% (Ready mix @ 1kg/ha) PE followed by Topramezone 33.6 SC (20.6 g a.i./ha) EPoE at 21 DAS (T7), Pendimethalin 30 EC formulation + Imazethapyr 2% (Ready mix @ 1kg/ha) PE followed by Topramezone 33.6 SC (25.7 g a.i./ha) EPoE at 21 DAS (T8),Weed free check (weeding at 20and 40 DAS) (T9), Weedy check (T10). Results revealed that the experimental field Medicago denticulate, Chenopodium album, Echinoclhoa colona, and some other weeds were dominant and observed throughout the crop growth period. Weed free (weeding at 20 and 40 DAS) (T9) followed by Pendimethalin 30 EC + Imazethapyr 2% (Ready mix) @1.0 kg/ ha PE + one hoeing at 30 DAS (T6), Topramezone 33.6 SC formulation (20.6 g i./ha) EPoE at 14 DAS (T1), and Pendimethalin 30 EC formulation + Imazethapyr 2% (Ready mix @ 1kg/ha) PE followed by Topramezone 33.6 SC (20.6 g a.i./ha) EPoE at 21 DAS (T7) were most appropriate for reducing weed density, weed dry matter production, lowest weed growth rate and gave highest weed control efficiency.