Weed density and control efficiency of different weed control methods in transplanted rice in Nepal

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-۱۱, Rupakot, Nepal during Rainy season of ۲۰۱۷. Ten treatments (one manual weeding at ۲۱ days after transplanting (DAT) (T۱); two manual weeding at ۲۱ and ۴۲ DAT (T۲); three manual weeding at ۲۱, ۴۲, and ۶۳ DAT (T۳); single cono weeding at ۲۱ DAT (T۴); double cono weeding at ۲۱ &۴۲ DAT (T۵); triple cono weeding at ۲۱, ۴۲, and ۶۳ DAT (T۶); butachlor as pre emergence (T۷); butachlor with single manual weeding at ۲۱ DAT (T۸); butachlor with double manual weeding at ۲۱ & ۴۲ DAT (T۹) and weedy check (T۱۰) were laid in randomized complete block designs (RCBD) with three replications. At ۳۰ DAT, the highest weed density was recorded at unweeded check (T۱۰) while it was the lowest at butachlor with double manual weeding (T۹). At ۶۰ DAT the effective weed control method on weed density was found to be double manual weeding (T۲). At ۹۰ DAT triple cono weeding (T۶) was found to be more effective on controlling weed density (۳۰) and was at par double manual weeding (T۲), double cono weeding (T۵) and butachlor with double manual weeding (T۹). WCE was the highest in the plot treated with butachlor with double manual weeding at ۲۱ and ۴۲ DAT (T۹) and the lowest in the plot treated with butachlor pre emergence (T۷) at ۳۰ DAT. At ۹۰ DAT, WCE in the plot treated with triple weeding (T۶) was found the highest (۷۸.۶۳%) and the lowest in the plot treated with butachlor as pre emergence (T۷) (۲۶.۱۴%).

کلیدواژه ها:

Major weed ، Weed recovery percentage ، Weed population