Preliminary studies on synergism and mechanisms of six organosilicon additives on fomesafen

The weed control effect of fomesafen with six different organosilicon additives, including Agrowet 818, Agrowet 820, GY-S903, Sio-683, TD-600, TD-6408, and the corresponding and synergism mechanism were determined by the pot experiments. The weed control effect of fomesafen mixed with different organosilicon additives were measured by spraying it on abutilon at the 4-5 leaf stage. Older leaves of abutilon were used to measure the surface tension, spreading diameter and retention. The results demonstrate that fomesafen mixed with different organosilicon additives can increase weed control effect by 15.88%-23.04%, significantly reduce the surface tension from 60.7mN/m to 20-25 mN/m, increase the retention by 30%-70% and increase the spreading diameter from 4.7 mm to 6.5-8.2 mm. It is noteworth that a mixture of Agrowet 820. Organosilicon additive and Agrowet 820 is able to decrease the surface tension by 65%,increase the spreading diameter by 69%, increase the retention by 74% and improved weed control effect by 23.04%.