Sami Publishing Company (SPC) Journal of Research in Weed Science 2651-4699 3 3 2020 09 01 Weed density and control efficiency of different weed control methods in transplanted rice in Nepal 263 269 100402 10.26655/JRWEEDSCI.2020.3.2 EN Robinson Adhikary Ministry of Agriculture and Livestock Development, Nepal Bishnu Bilas Adhikari Institute of Agriculture and Animal Science, Tribhuvan University, Nepal Bishnu Prasad Kandel Department of Plant Breeding, Post Graduate Program, Institute of Agriculture and Animal Science, Tribhuvan University, Kathmandu, Nepal Journal Article 2019 09 02 This study was performed to evaluate the weed density and weed control efficiency (WCE) on transplanted rice under different treatments at a farmer’s field, Bhanu-11, Rupakot, Nepal during Rainy season of 2017. Ten treatments (one manual weeding at 21 days after transplanting (DAT) (T<sub>1</sub>); two manual weeding at 21 and 42 DAT (T<sub>2</sub>); three manual weeding at 21, 42, and 63 DAT (T<sub>3</sub>); single <em>cono</em> weeding at 21 DAT (T<sub>4</sub>); double <em>cono</em> weeding at 21 &42 DAT (T<sub>5</sub>); triple <em>cono</em> weeding at 21, 42, and 63 DAT (T<sub>6</sub>); butachlor as pre emergence (T<sub>7</sub>); butachlor with single manual weeding at 21 DAT (T<sub>8</sub>); butachlor with double manual weeding at 21 & 42 DAT (T<sub>9</sub>) and weedy check (T<sub>10</sub>) were laid in randomized complete block designs (RCBD) with three replications. At 30 DAT, the highest weed density was recorded at unweeded check (T<sub>10</sub>) while it was the lowest at butachlor with double manual weeding (T<sub>9</sub>). At 60 DAT the effective weed control method on weed density was found to be double manual weeding (T<sub>2</sub>). At 90 DAT triple <em>cono </em>weeding (T<sub>6</sub>) was found to be more effective on controlling weed density (30) and was at par double manual weeding (T<sub>2</sub>), double <em>cono</em> weeding (T<sub>5</sub>) and butachlor with double manual weeding (T<sub>9</sub>). WCE was the highest in the plot treated with butachlor with double manual weeding at 21 and 42 DAT (T<sub>9</sub>) and the lowest in the plot treated with butachlor pre emergence (T<sub>7</sub>) at 30 DAT. At 90 DAT, WCE in the plot treated with triple weeding (T<sub>6</sub>) was found the highest (78.63%) and the lowest in the plot treated with butachlor as pre emergence (T<sub>7</sub>) (26.14%). Major weed Weed recovery percentage Weed population https://www.jrweedsci.com/article_100402_0c9de7fbac44fdcea080c61e55772199.pdf