Effects of adding organosilicon adjuvants to Langdujing on enhancing control effect and plant diversity of grassland communities

Langdujing as the main agent produced by Qinghai Academy of Animal and Veterinary Sciences, the Zhankuo 100, Heze, Quick as the organosilicon adjuvants, the different combinations of herbicide were selected to study the control effects and the influence on plant diversity of grassland communities in Jiangxigou County, Qinghai Province where distributed grave Stellera chamaejasme in Kobresiahumilis grassland. The results showed that the amount of Langdujing was the most important factor for control effect and the type and the concentration of organosilicon adjuvants was side effect for control effect which suggested the optimal combination was 675 mLha-1 Langdujing and 112.5 mLha-1 Quick with the control effect of 96.8%. Comparing with the control, the indices of plant diversity decreased in first year and increased in the second year and the structure of plant community tended to better. At the same time, any combination of herbicide was safe for Gramineaess forge.