This study was conducted to find out the influence of organic silicon surfectant in addition to the efficacy of some herbicides recommend in wheat. The wheat variety called "Gonen" was used for field trial that set up in Kocagol Village of Manyas District in Balkesir in 2009. Three different doses of fenexoprop-p-ethyl (60, 80 and 160 ml/da) and mesosulfuron-methyl+iodosulfuron-methyl-sodium (15, 20 and 40 ml/da) and doses of addition organic silicon surfactant (40 ml Sylgard309*/100 liter water) to these herbicides were applied post emergence. The aim of this research was to find out that the increase is provided by adding fenexoprop-p-ethyl. By trying these and other herbicides it came out that there established no increase.
