Effect of different doses of herbicides and mechanical weeding on yield attributes and grain yield of direct seeded rice (Oryza sativa L.) varieties under Inseptisols of Chhattisgarh plain

Abstract

The experiment was conducted at Research cum Instructional Farm, IGKV, Raipur (Chhattisgarh) during Kharif season 2015-2016. The soil of experimental field was sandy loam in texture (Inceptisols) known as Matasi. The Experiment was laid out in Factorial Randomized Block Design (FRBD) with three replications. The treatment consisted of three varieties viz. MTU-1010 (V1), Indira barani dhan (V2) and IR-64 (V3) and four weed management practices viz. ­Rinskor @ 37.5 ml a.i. ha-1 at 20 DAS (H1), H2 - Rinskor @ 75 ml a.i. ha-1 at 20 DAS, Mechanical weeding at 20 and 40 DAS (H3) and Control (H4). The results of experiment indicated that variety MTU-1010 (V1) registered significantly highest values of growth characters of rice like leaf area, plant population, dry matter accumulation and number of tillers. It was at par to variety IR-64 (V3) for above parameters. Among weed management practices, Mechanical weeding at 20 and 40 DAS (H3) registered significantly highest values of growth parameters of rice like plant population, leaf area, dry matter accumulation and number of tillers, but it was comparable to Rinskor @ 37.5 ml a.i. ha-1 at 20 DAS (H1). Among the varieties, higher grain yield and B:C ratio was recorded under MTU-1010 (V1) as regards to weed management practices maximum grain yield and B:C ratio were obtained under Mechanical weeding at 20 and 40 DAS (H3).