Abstract
A study was designed on the way to evaluate and identify the pre and post emergence herbicide combinations in transplanted rice variety ‘ASD 16’ during February-May 2020 at the Experimental Farm, Department of Agronomy, Annamalai University, Tamil Nadu, India. The experiment was laid out in randomized block design with three replications and fourteen treatments. The treatment details includes sequential application of pre and post emergence herbicide viz., pre-emergence herbicides (butachlor, pretilachor and pyrazosulfuron ethyl) and post emergence herbicides (bispyribac sodium, metsulfuron methyl + chlorimuron ethyl, fenoxaprop-p-ethyl and triafamone + ethoxysulfuron), hand weeding twice (20 and 40 DAT) and unweeded control plot. All the weed management practices were found to be significantly influenced the weed biometrics, growth attributes, grain and straw yields of transplanted rice. The result of the study clearly showed that hand weeding twice at 20 and 40 days after transplanting (DAT) significantly registered lesser weed dry matter production, weed index, maximum weed control index (WCI), higher growth attributes viz., plant height, number of tillers hill-1, DMP, grain and straw yields.
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