Weed Management in Rice Fallow Black Gram through Post-Emergence Herbicides

Abstract

Field experiments were conducted at Tamil Nadu Rice Research Institute, Aduthurai during Rabi season of 2011 and 2012 to find out the suitable early post-emergence herbicides to manage the emerged weeds and re-growth of paddy stubbles in rice fallow black gram. The treatments consisted of three levels (50, 75 and 100 g/ha) of early post- emergence herbicides viz., Imazethapyr 10% SL and Quizalofop ethyl 5% EC which were tested alone and in combination and also compared with farmers’ practice of no weeding. Results revealed that lesser weed density was obtained with application of imazethapyr + quizalofop ethyl, each at75g/ha in both the years. Application of quizalofop ethyl alone or in combination with imazethapyr at all the three levels recorded higher weed control efficiency (> 80%) over imazethapyr alone. Higher mean yield of 721 kg/ha was obtained with application of both herbicides each at 50 g/ha and it was comparable with all the quizalofop ethyl treatments as well as application of both herbicides at all the doses. Higher mean net return of Rs.25375/ha was registered with application of both herbicides, each at 50 g/ha. However, higher return per rupee invested (BC Ratio) was obtained under application of quizalofop ethyl alone at 50g/ha during both the years (3.43). Thus, based on the weed control efficiency, seed yield and returns, it could be concluded that application of quizalofop ethyl at 50g/ha on 20 DAS will be effective for controlling emerged grassy weeds and re-growth of paddy stubbles in rice fallow black gram.

DOI

https://doi.org/10.29321/MAJ.10.001126

Pages

313 - 316

Creative Commons

Copyright

© The Author(s), 2025. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

Keywords