Investigation of mechanical and chemical weeds management on rice agronomical traits

In order to investigation of mechanical and chemical weeds management on Fajr cultivar of rice agronomical traits، an experiment was conducted in Rice Research Institute at Amol، Mazandaran province، Iran during 2010 growing season. The experiment was conducted as a spilt-plot trail under Randomized Complete Block Design (RCBD) with three replications and 21 treatments. Main plots at three levels were without cono-weeder application، one time cono-weeder and two time applications cono-weeder and subplots at seven levels were Bentazon herbicide، Londux، Ronestar، Butachlor، Satern، hand weeding and without herbicide (weed infested). Results showed that cono-weeder effects، herbicide application and interaction effects of both methods، had significant effect at 1% level on all of rice plant measured traits. Between integrated treatments، twice cono-weeder applications without herbicide، hand weeding treatment and also twice cono-weeder applications including different herbicide application have shown highest grain yield، so that، between three treatments، Twice application of cono-weeder without using of herbicide، was the best treatment.