the effect of integrated control methods of broadleaf weeds density on sugar beet yield in kermanshah zone

in order to study the impacts of mechanical (using cultivation), chemical (using herbicides) methods and their integration in controlling broadleaf weeds in sugar beet fields, this experiment was carried out as a randomized complete block design with 4 replications in mahidasht-kermanshah in 2006.  in this experiment, 9 different treatments consisting a mixture of post-emergence herbicides phenmedipham + desmedipham +  ethofumesate and triflusulfuron methyl with sittogate combined with cultivation and 2 check treatments with and without control of the weeds were investigated. the results indicated that cultivation treatment accompanied by triflusulfuron methyl reduced dry weight of weeds by 54.91% and showed 100% control of amaranthus spp. in comparison with control treatment. cultivation treatment combined with a mixture of phenmedipham+desmedipham+ethofumesate and triflusulfuron methyl with sittogate increased the sugar beet root dry weight by 159.89% and caused 100% control of the density of conringia orientalis. phenmedipham+desmedipham+ethofumesate plus triflusulfuron methyl with sittogate treatment increased root yield by 121.86% compared to the check. in conclusion, the highest root yield was obtained in the cultivation treatment combined with phenmedipham + desmedipham+ethofumesate, a mixture of phenmedipham + desmedipham + ethofumesate and triflusulfuron methyl with sittogate and cultivation treatments in sugar beet.