Ecology, Environment and Conservation Paper

Vol 23, Issue 2, 2017; Page No.(1206-1210)

MANAGEMENT OF WEEDS TO ENHANCE THE PRODUCTION OF DIRECT SEEDED UPLAND RICE UNDER TRIPURA CONDITION

Mandira Chakraborti, Buddhadeb Duary and Mrinmoy Datta

Abstract

A field experiment was conducted during the kharif season of 2013 and 2014 at Krishi Vigyan Kendra, South Tripura to evolve effective weed management practices for direct seeded upland rice. The experiment consisted of twelve treatments laid out in randomized complete block design with three replication. The predominant weed flora observed in the experimental field were Amaranthus viridis, Oldenlendia corymbosa, Spilanthes acmella, Ludwigia parviflora, Cleome rutidosperma, Malvestrum coromondalianeum among the broad leaf weed, Digitaria sanguinalis among grasses and Cyperus iria among sedges. The result of the experiment reveals that though the hand weeding thrice at 15, 30 and 45 DAS (T11) recorded lowest weed dry weight, weed population for all types of weed and higher yield and yield attributing parameters of upland rice but it was not not economically viable. The treatment pendimethalin at 1.0 kg ha-1 at 2 DAS + bispyribac sodium at 25 g ha-1 at 20 DAS (T4) recorded the highest net return and return per rupee invested and appeared to be the most promising and remunerative weed management practice for direct seeded rice followed by pendimethalin at 1.0 kg ha-1 at 2 DAS + one hand weeding at 30 DAS.

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