Effect of Some Adjuvants on Sulfosulfuron Efficacy in Hordeum spontaneum Control in Wheat Fields

Field experiments were conducted to evaluate the effect of various adjuvants on reducing Hordeum spontaneum damage in wheat fields at Karaj, Kamyaran and Marvdasht during 2013 and 2014. Treatments comprised sulfosulfuron, sulfosulfuron + ammonium sulfate, sulfosulfuron + volck oil, sulfosulfuron + fenitrothion (a phosphorus insecticide), sulfosulfuron + metsulfuron all in recommended doses and check plots. Results revealed that there were similarities among locations of experiment. Furthermore, sulfosulfuron + ammonium sulfate had the highest efficiency to control H. spontaneum compared to other treatments. In general, although herbicide + adjuvant applications in second nod of the weed had the highest effect on fresh and dry weight, weight and seed diameter (10, 15, 18, and 9 percent respectively) of H. spontaneum, its application in tillering stage was superior because of better control of other weeds and likewise enhanced wheat characteristics. Also, sole application of sulfosulfuron had the lowest effect on H. spontaneum control. According to these results applying sulfosulfuron + ammonium sulfate in the tillering stage of H. spontaneum was recommended in infested areas.