Weed parameters and yield of aerobic rice (Oryza sativa L.) As influenced by weed management practices under different seeding methods

Abstract

A field experiment was conducted at College Farm, College of Agriculture, Professor Jayashankar Telangana State Agricultural University (PJTSAU), Rajendranagar, Hyderabad, during kharif, 2014. The soil of the experimental field was sandy loam in texture with pH of 7.6. The experiment was laid out in factorial randomized block design with two factors. Pretilachlor as pre-emergence herbicide, is not effective against grasses and sedges while azimsulfuron was the new selective, post-emergence herbicide was found to be most efficient against sedges and broadleaf weeds & less effective against grassy weeds. However, sequential application of herbicides along with one hand weeding was reported to be more effective than application of herbicides alone, hence the present investigation was undertaken to study the efficacy of sequential application of pre and post emergence herbicides. Herbicidal treatments significantly influenced the dry matter production of weeds as well as grain yield. Lowest weed dry matter (10.5) as well as higher WCE (95.5) was recorded with hand weeding thrice at 60 DAS. Which was at par with T6-(Pretilachlor 50%EC @ 0.75 kg ai /ha as PE fb Azimsulfuron 50%W.P@ 35g.ai/ha+ cyhalofop butyl 10% EC@ 75 g. ai/ha as PoE 15- 20 DAS fb HW at 50 DAS) with regard to WCE (95.3 %) and grain yield (3218.3 kg/ha) indicating that weeds are controlled efficiently with sequential application of herbicides resulted in Higher grain yield.