Efficacy of pre-emergence herbicides for control of complex weed flora in transplanted rice Mohapatra S.*, Tripathy S.K., Nayak B.R., Mohanty A.K. Regional Research and Technology Transfer Station, Orissa University of Agriculture and Technology, Chiplima, Sambalpur, Odisha, 768 025 *Corresponding author: sanjukta.mohapatra34@gmail.com
Online published on 27 December, 2017. Abstract A field experiment was conducted at Chiplima, Sambalpur, Odisha during the rainy season of 2014 and 2015 to study the effect of sand-mix application of pre-emergence herbicides on weed population yield and economics of transplanted rice (Oryza sativa L.). Application of chlorimuron + metsulfuron 4 g/ha, bensulfuron 60 g/ha and pyrazosulfuron 16 g/ha alone was selectively effictive on broad-leaf weeds while pretilachlor 500 g/ha was effective on grasses. Pre-emergence application of pyrazosulfuron with pretilachlor (16 + 500 g/ha) was more effective in minimizing the density (10/m2), biomass (4.8 g/m2) of weeds and enhancing the weed control efficiency (89.3%), grain yield (6.14 t/ha), net returns (` 53.2 x 103/ha) and benefit: cost ratio (1.37) than pretilachlor alone. Top Keywords Bensulfuron-methyl, Chlorimuron-ethyl + metsulfuron-methyl, Herbicide mixture, Pretilachlor, Pyrazosulfuron-ethyl, Transpalnted rice, Weed control. Top |