Effect of Crop Establishment Methods and Weed Management Options on Weed Dynamics and Performance of Basmati Rice (Oryza Sativa L.)

Abstract

A field experiment entitled “Effect of crop establishment methods and weed management options on weed dynamics and performance of Basmati rice (Oryza Sativa L.)” was carried out at Crop Research Centre of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut- 250110 (U.P.)during kharif season of 2019 and 2020. Experiment was laid out in split plot design with four replications. Main factors consist of the crop establishment methods viz. (1) Conventional Puddled Transplanting (CPT), (2) Unpuddled Flat (UPF) and (3) Furrow Irrigated Raised Beds (FIRB) and the sub factors consist of five weed management options viz., (1) Pretilachlor @ 0.75 Kg ha-1 PE fb Bispyribac sodium @ 20 g a.i. ha-1 PoE at 20 DAT, (2) Almix 4 g a.i. ha-1 + Bispyribac sodium @ 20 g a.i. ha-1 PoE at 20 DAT, (3) Bispyribac sodium @ 25 g a.i. ha-1 PoE at 20 DAT, (4) Two hand weedings and (5) Weedy check. Results revealed that among all the crop establishment methods,conventional puddled transplanting (E1) exhibited significant influence on the growth, yield attributes and yield of basmati rice followed by furrow irrigated raised bed method (E3) and the lowest growth, yield attributes and yield were found under unpuddled flat method (E2) during both the years. However, furrow irrigated raised bed method (E3) showed better effect on yield attributes, soil properties and profitability of rice. Among the different treatments, two manual weeding to keep the plot weed free was the most effective weed control measure which resulted in higher value of weed control efficiency andit was statistically at par to Pretilachlor @ 0.75 kg ha-1fb Bispyribac sodium @ 20 g a.i. ha-1 and Almix 4 g a.i. ha-1 + Bispyribac sodium @ 20 g a.i. ha-1. Highest growth parameters, yield and yield attributes of rice and nutrient uptake was noticed with the application of Pretilachlor @ 0.75 kg ha-1fb Bispyribac sodium @ 20 g a.i. ha-1. Among herbicide treatments Pretilachlor @ 0.75 kg ha-1fb Bispyribac sodium @ 20 g a.i. ha-1 was found excellent in gross return, net return, and B: C ratio which was at par with the Almix 4g a.i. ha-1 + Bispyribac sodium @ 20 g a.i. ha-1. Thus, the application of pretilachlor @ 0.75 kg ha-1fb Bispyribac sodium @ 20 g a.i. ha-1 seems better for higher productivity and profitability of rice. Therefore, furrow irrigated raised bed method with pretilachlor @ 0.75 Kg ha-1fb Bispyribac sodium @ 20 g a.i. ha-1 weed management option proved to be better.