Effect of Various Weed Control Treatment on Economics of Direct Seeded Rice under Puddle Condition

The present investigation was conducted at Instructional Farm of Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.) India during the Kharif season (June-October) 2008. The experiment was laid out in Randomized Block Design comprised of eight treatments of various combinations of different herbicides viz., T₁:PIH 2023 10% SC 15 g a.i/ha at 18 DAS; T₂ : PIH 2023 10% SC 20 g a.i/ha at 18 DAS; T₃ : PIH 2023 10% SC 25 g a.i/ha at 18 DAS; T₄ : PIH 2023 10% SC 30 g a.i/ha at18 DAS; T₅ : PIH 202310% SC 60 g a.i/ha at 18 DAS T₆ : Almix 20% WP 4 g a.i/ha 18 DAS; T₇ :Control (unweeded check) and T₈ : Hand weeding at 30 DAS with three replications. Rice cultivar "IR-64" was grown as a test crop. Rice was manually sown with a seed rate of 60 kg ha^-1 on 25^th July, 2006 and harvested on 15^th and 16^th November, 2006. The crop was fertilized with 100:60: 40 kg NPK ha^-1, respectively. Results revealed that almost all growth parameters, yield attributes and grain yield were maximum under of PIH 2023 10% SC @ 60 g a.i ha^-1 over rest of the treatments. Echinochloa colona, Cyperus spp., F. miliaceae, L. hyssopifolia were the pre-dominant weeds in experimental plot. Minimum weed density was noted under post emergence application of almix 4 g ha^-1 and PIH 2023 25 g ha^-1 at 20, 40, 70 and 90 DAS. Whereas, at harvest lower dry matter of weeds and highest weed control efficiency was recorded under almix 4 g ha^-1 (T₆), PIH 2023 25 g ha^-1 and PIH 2023 60 g ha^-1, respectively. It was found effective to control broad spectrum of weeds viz., grasses, sedges and forbs.