有机硅助剂对7种杀虫剂在剑麻叶上润湿性能的影响

研究农田常用的杀介壳虫药剂在剑麻叶片上的润湿性能，并通过添加适量的有机硅助剂提高杀虫剂的使用效率。采用Zisman作图法测定剑麻的临界表面张力，并与推荐剂量下7种杀虫剂药液的表面张力值，及添加不同浓度有机硅助剂后药液的表面张力值进行比较分析。结果表明，剑麻的临界表面张力值为23.89 m N/m,7种杀虫剂的表面张力值为35.72～72.51 mN/m，均大于剑麻的临界表面张力，药液在剑麻叶上润湿性较差。有机硅助剂能够降低药液的表面张力，当45%毒死蜱EC 450 mg/L中加入有机硅500 mg/L,4.5%高效氯氰菊酯EC 45 mg/L和70%吡虫啉WG 350 mg/L中加入有机硅200 mg/L，其余4种杀虫剂中添加有机硅100 mg/L时，药液的表面张力降至剑麻的临界表面张力以下，药液的润湿性能得以提升。因此，在麻田害虫防治上，建议在农药制剂中添加适量的有机硅助剂来改善药液在叶片上的润湿性能，进而提高农药的利用率。

Effect of Organosilicone Adjuvant on Wettability of 7 Insecticides on Sisal Leaves

The paper aims to study the wettability of scalecide solution commonly used in farmland on sisal leaves, and choose suitable adjuvants to improve the utilization of insecticides. The critical surface tension of sisal leaf was determined by Zisman method, and compared with the surface tension values of 7 insecticides at the recommended dosage, and the surface tension values after adding different concentrations of organosilicone adjuvant. The critical surface tension of sisal leaf was 23.89 mN/m. The surface tension of the 7 insecticides ranged from 35.72 to 72.51 mN/m, which were all higher than the critical surface tension of sisal leaf, and the wettability of the solutions was poor. Organosilicone adjuvants could reduce the surface tension of the insecticides. By adding 500 mg/L silicone to 45% chlorpyrifos EC 450 mg/L, 200 mg/L silicone to 4.5% beta-cypermethrin EC 45 mg/L and to 70% imidacloprid WG 350 mg/L, and 100 mg/L silicone to the other four insecticides, the surface tension of the solutions was lower than the critical surface tension of sisal leaf and the wetting effect of the solutions was good. Therefore, the adjustment and addition of adjuvants can improve the effect and the utilization rate of pesticides in the process of sisal disease and pest control.