Vol. 10, Issue 9 (2021)

Author(s):
Sanju Kumari, Birendra Kumar, Seema, Kanhaiya Lal and Devashish Kumar

Abstract:
A field experiment was conducted during rabi season of 2019-20 at research farm of Bihar Agricultural University, Sabour, Bhagalpur to assess the effect of various pre and post-emergence herbicides in chickpea. The experiment consisted of 13 treatments viz. pendimethalin @ 1000 g a.i. ha^-1 PE fb 1 HW, oxyfluorfen @ 100 g a.i. ha^-1 PE fb 1 HW, imazethapyr @ 40 g a.i. ha^-1 PoE, quizalofop-ethyl @ 50 g a.i. ha^-1 PoE, topramezone @20 g a.i. ha^-1 PoE, topramezone @25 g a.i. ha^-1 PoE, clodinafop-propargyl + Na-acifluorfen @ 500 g a.i. ha^-1 PoE, pendimethalin @ 1000 g a.i. ha^-1 PE fb imazethapyr @ 40 g a.i. ha^-1 PoE, pendimethalin @ 1000 g a.i. ha^-1 PE fb quizalofop-ethyl @ 50 g a.i. ha^-1 PoE, oxyfluorfen @ 100 g a.i. ha^-1 PE fb imazethapyr @ 40 g a.i. ha^-1 PoE, oxyfluorfen @ 100 g a.i. ha^-1 PE fb quizalofop-ethyl @ 50 g a.i. ha^-1 PoE apart from weedy check and weed free and followed a randomized block design with three replications. Out of the 13 treatment weed free recorded highest yield be it grain or straw which was statistically at par to treatments topramezone @ 25 g a.i. ha^-1, pendimethalin @ 1000 g a.i. ha^-1 fb 1 HW, oxyfluorfen @ 100 g a.i. ha^-1 fb 1 HW, topramezone @ 20 g a.i. ha^-1. Weed density and biomass were found significantly lower in weed free treatment which was statistically at par to pendimethalin @ 1000 g a.i. ha^-1 fb 1 HW, oxyfluorfen @ 100 g a.i. ha^-1 fb 1 HW, topramezone @ 25 g a.i. ha^-1, topramezone @ 20 g a.i. ha^-1. The highest net return and benefit cost ratio was recorded under topramezone @ 25 g a.i. ha^-1 which was statistically at par to topramezone @ 20 g a.i. ha^-1, pendimethalin @ 1000 g a.i. ha^-1 fb quizalofop-ethyl @ 50 g a.i. ha^-1 and pendimethalin @ 1000 g a.i. ha^-1 fb 1 HW, oxyfluorfen @ 100 g a.i. ha^-1 fb 1 HW, Oxyfluorfen @ 100 g a.i. ha^-1 at 1DAS fb Imazethapyr @ 40 g a.i. ha^-1 and Oxyfluorfen @ 100 g a.i. ha^-1 at 1DAS fb quizalofop-ethyl @ 50 g a.i. ha^-1 at 25DAS. Hence, it can be concluded that application of topramezone @ 25 g a.i. ha^-1, topramezone @ 20 g a.i. ha^-1, pendimethalin @ 1000 g a.i. ha^-1 fb 1 HW and oxyfluorfen @ 100 g a.i. ha^-1 fb 1 HW are equally effective with higher benefit cost ratio where labour is scarce.