Efficacy of pre-seeding application of two formulations of paraquat dichloride in managing weeds in dry direct-seeded rice
2021
Pratap, Tej | Singh, V Pratap | Singh, S.P. | Kumar, Abnish | Saini, Soniya | Tripathi, Neeta
A field experiment was conducted at GBPUA&T, Pantnagar during Kharif (rainy) season of 2015 to evaluate and compare the efficacy of pre-seeding application, at 2 days before seeding (DBS), of two formulations of paraquat dichloride on weeds associated with dry direct-seeded rice (dry-DSR) and assess their possible phytotoxicity to rice crop. Two formulations of paraquat dichloride include: i. Sponsor sample (SS) (paraquat dichloride 45% SL) tested at 300, 450, 800, 1600 g/ha and ii. Commercially available paraquat dichloride market sample (MS) tested at 800 g/ha. The paraquat dichloride at 1600 g/ha provided 85–95% weed control efficiency at all crop growth stages. All the herbicidal treatments were found significantly superior over hand weeding twice [(before sowing and at 20 days after seeding (DAS)]. The highest grain yield (3.3 t/ha) was obtained with paraquat dichloride 1600 g/ha followed by 800 g/ha. No symptoms of phytotoxicity were observed on dry-DSR at any of the doses of both the formulations of paraquat dichloride applied two days before seeding rice. Paraquat dichloride (SS) efficacy at 1600 and 800 g/ha applied 2 DBS was at par with each other in effectively managing broad spectrum weeds in dry direct-seeded rice in Tarai water (lowland) region of Uttarakhand.
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