Sustainable weed management approaches for cultivation of upland rice under Tripura condition
Mandira Chakraborti and Buddhadeb Duary
A field experiment was carried out during the kharif seasons of 2013 and 2014 to develop sustainable weed management practices for upland rice in Tripura. The study included twelve treatments arranged in a randomized complete block design with three replications. The predominant weed species identified in the experimental area included Amaranthus viridis, Hedyotis corymbosa, Spilanthes acmella, Ludwigia parviflora, Cleome rutidosperma, and Malvaestrum coromandalinum among broadleaf weeds, as well as Digitaria sanguinalis among grasses and Cyperus iria among sedges. Among the various treatments, hand weeding three times at 15, 30, and 45 days after sowing (DAS) resulted in the lowest weed dry weight for all weed types in both years, followed by the combination of pendimethalin with one hand weeding and pendimethalin with bispyribac sodium. Although the highest grain and straw yields were achieved with the thrice hand weeding at 15, 30 and 45 DAS treatment during both years, it was not economically feasible. Among the different weed management strategies, the combination of pendimethalin at a rate of 1.0 kg ha-1 applied at 2 DAS and bispyribac sodium at a rate 25 g ha-1 applied at 20 DAS yielded the highest net returns and return per rupee invested, making it the most effective and profitable weed management approach, followed by the treatment of pendimethalin at 1.0 kg ha-1 at 2 DAS combined with one hand weeding at 30 DAS for direct-seeded upland rice in Tripura.
Mandira Chakraborti, Buddhadeb Duary. Sustainable weed management approaches for cultivation of upland rice under Tripura condition. Int J Res Agron 2025;8(1S):288-291. DOI: 10.33545/2618060X.2025.v8.i1Se.2386