Integrated Weed Management Approach for The Mitigation of Complex Weed Flora in Transplanted Rice Systems

Lakshmanakumar Periyannan¹*, Sreegayathri Elango² and Saran Rajan^3
1Associate Professor (Agronomy), Department of Agronomy, Adhiyamaan College of Agriculture and Research, Athimugam, Krishnagiri, Tamil Nadu, India
²Ph.D scholar, Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India
³Associate Manager, Sumitamo chemicals (i) Pvt. Ltd., Bangalore, India
*Corresponding Author: Lakshmanakumar Periyannan, Associate Professor (Agronomy), Department of Agronomy, Adhiyamaan College of Agriculture and Research, Athimugam, Krishnagiri, Tamil Nadu, India.

Published: November 14, 2023

DOI: 10.55162/MCAES.05.145

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Abstract  

Rice (Oryza sativa L.) is a staple food crop popularly grown in more than 100 countries with 90% of the total global production from Asia. Major constraint in paddy cultivation is heavy weed infestation which causes 50-90 % yield reduction. Weeds causes adverse effects to crops in many ways and this arise due to the unusual adaptation characteristics of the weeds and their regeneration ability. To achieve timely and effective weed control, broad-spectrum herbicide based integrated weed management may offer a pathway for simultaneously reducing costs and markedly increasing productivity. A field experiment was conducted during the Navarai (Late Rabi) Season of 2023 to investigate the efficacy of new herbicide combinations for the management of weed flora in transplanted paddy at Field No. A18, ACAR Farm, Adhiyamaan College of Agriculture and Research, Krishnagiri district situated at North western zone of Tamil Nadu. The experiment was conducted with nine treatments where six treatments are combination of herbicides, two cultural operations and one untreated check. The field experiment was designed using randomized block designs with three replications. The experiment results revealed that the post emergence application of Bispyribac sodium 10% SC + (Metsulfuron-methyl+ Chlorimuron ethyl) 250+20 ml ha^-1 followed by Cono weeding twice on 15 and 30 DAT enhanced the growth and yield of transplanted paddy with decreased weed growth, reduction in nutrient depletion by weeds and enhanced nutrient uptake by the crop. The treatment positively influenced growth and physiological parameters like plant height, number of tillers, leaf area index and also recorded distinctly higher grain yield (6.5 tonnes ha^-1), net return (Indian Rupees 114923.2 ha^-1) and benefit cost ratio (3:10). Combination of herbicides along with cono weeding increased cropping system sustainability and reduced selection pressure for weed resistance to herbicides.

Keywords: Transplanted paddy; Bispyribac sodium; Cono weeding; Weed control efficiency; Yield

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