Crop establishment and weed management effects on weed flora andyield of dry direct-seeded basmati rice (Oryza sativa) inthe north-western Indo-Gangetic plains

BUTA SINGH DHILLON; GURPREET  KAUR; KANU PRIYA  SHARMA; RAMANJIT  KAUR; NAVJOT  SIDHU; R MAHENDERA  KUMAR

doi:10.56093/ijas.v96i5.176042

Authors

BUTA SINGH DHILLON Punjab Agricultural University, Ludhiana, Punjab 141 004, India
GURPREET KAUR Punjab Agricultural University, Ludhiana, Punjab 141 004, India
KANU PRIYA SHARMA Punjab Agricultural University, Ludhiana, Punjab 141 004, India
RAMANJIT KAUR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
NAVJOT SIDHU Punjab Agricultural University, Ludhiana, Punjab 141 004, India
R MAHENDERA KUMAR ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad 500 030, Telangana, India

https://doi.org/10.56093/ijas.v96i5.176042

Keywords:

Bispyribac sodium, Integrated weed management, Pendimethalin, Sequential herbicide application

Abstract

Despite the manifold advantages of dry direct-seeded rice (Oryza sativa L.), its adoption is constrained by severe weed infestation during the early stages of crop development. Therefore, a field experiment was conducted to evaluate the effect of crop establishment methods and weed management practices on weed dynamics, growth and yield of direct-seeded basmati rice during rainy (kharif) season of 2021 and 2022 at Punjab Agricultural University, Ludhiana, Punjab. The experiment was laid out in a split-plot design with four crop establishment methods in main plots (broadcasting, line sowing, raised bed sowing on 1 m and 0.67 m beds) and four weed management practices in sub-plots [manual weeding, pendimethalin @0.75 kg/ha (pre-emergence) + bispyribac sodium @0.25 kg/ha (postemergence), pendimethalin @0.75 kg/ha (pre-emergence) + manual weeding, and mechanical weeding]. Line sowing significantly reduced sedge density while total weed dry matter was comparable under line sowing and bed sowing, which was significantly lower than broadcasting. Sequential application of pendimethalin followed by bispyribac sodium effectively reduced weed density and biomass was comparable with pendimethalin followed by one manual weeding. Line-sowing and 1 m raised bed sowing methods produced significantly higher grain yield than 0.67 m bed and broadcasting. The study concluded that line sowing or 1.0 m raised bed sowing combined with sequential herbicide application can be an effective and practical strategy for effective weed management and improving productivity of direct-seeded basmati rice under Punjab conditions.

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