Vol. 11, Issue 8 (2022)

Author(s):
KC Ahirwar, VK Choudhary, MP Sahu, VK Singh and Vivek Kumar Dubey

Abstract:
A field experiment was conducted during Kharif 2021 at ICAR- Directorate of Weed Research, Jabalpur on different seed rate and weed management practices on weed severity and productivity in direct-seeded rice. The experiment was laid out in spilt plot design and replicated thrice, where main plots were assigned with four seed rate viz, 30, 40, 50 and 100 kg ha^-1 and sub-plots with four weed management practices viz. pendimethalin 678 g ha^-1 (2 days after sowing, DAS) followed by (fb) bispyribac-sodium 25 g ha^-1 (20 DAS), pretilachlor + pyrazosulfuron 615 g ha^-1 (2 DAS) fb cyhalofop + penoxsulam 135 g ha^-1 (20 DAS), pretilachlor + pyrazosulfuron 615 g ha^-1 (2 DAS) fb hand weeding (30 DAS) and weedy check. Result revealed that higher seed rate (100 kg ha^-1) has fewer weeds and lesser biomass hence obtained better weed suppression and it gradually decreased with lower seed rate and lowest at 30 kg ha^-1. Whereas grain yield was significantly (p<0.05) higher with, 40 kg ha^-1 over 30 kg ha^-1 but was comparable with 50 and 100 kg ha^-1. Among weed management practices, application of pretilachlor + pyrazosulfuron 615 g ha^-1 fb cyhalofop+penoxsulam 135 g ha^-1 provide broad-spectrum weed control at 30 DAS which was comparable to application of pretilachlor + pyrazosulfuron 615 g ha^-1 fb hand weeding at 30 DAS and next best was pendimethalin 678 g ha^-1 fb bispyribac-sodium 25 g ha^-1. On contrary, higher weed density and biomass with lowest grain yield was obtained under weedy check treatment. Therefore, 40 kg ha^-1 with pretilachlor + pyrazosulfuron 615 g ha^-1 fb cyhalofop+penoxsulam 135 g ha-1 can be adopted for better weed control and higher productivity in DSR.