助剂对10%苯醚甲环唑水分散粒剂在荔枝叶片表面润湿性能的影响  

Effects on wettability of 10% difenoconazole water dispersible granule with adjuvants on litchi leaves

作　　者：王潇楠 刘艳萍[1] 王思威[1] 孙海滨[1] WANG Xiaonan;LIU Yanping;WANG Siwei;SUN Haibin(Cruangdong Provincial Key Laboratory of High Technology for Plant Protection,Institute of Plant Protection,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China)

机构地区：[1]广东省农业科学院植物保护研究所广东省植物保护新技术重点实验室

出　　处：《农药学学报》2018年第6期803-808,共6页Chinese Journal of Pesticide Science

基　　金：国家重点研发计划(2016YFD0200206);国家荔枝龙眼产业技术体系(CARS-32-16);国家柑橘及热带作物产品质量安全风险评估专项(GJFP2018004)

摘　　要：采用接触角测量仪测定了10%苯醚甲环唑水分散粒剂(difenoconazole WG)不同倍数稀释液在荔枝叶片上的静态接触角和0~60 s动态接触角,用于计算荔枝叶片的临界表面张力和表面自由能,进而分析药液在荔枝叶片表面的润湿性能;采用全自动张力仪测定了在10%苯醚甲环唑WG不同稀释液中分别添加体积分数为0.4%的silwet stik和0.2%的as 1002种助剂后溶液的表面张力,研究了助剂添加前后表面张力的变化。结果表明:荔枝叶片近轴面的表面自由能为23.74mJ/m^2,远轴面的表面自由能为11.89mJ/m^2,均以色散力分量(非极性分量)为主导。在10%苯醚甲环唑WG 500倍稀释液中加入体积分数为0.4%的silwet stik溶液,其表面张力为21.90mN/m,低于荔枝叶片的临界表面张力(22.64mN/m),且在0~10S内接触角下降最快。研究结果表明:荔枝叶片的近轴面比远轴面更易被药液润湿;在荔枝园喷施10%苯醚甲环唑WG时,若在稀释倍数500倍的药液中添加0.4%的silwet stik助剂,则可使药液在叶片上能更快更好的润湿铺展。The critical surface tension (CST)of litchi leaf,as well as the surface free energy (SFE), surface tension,static contact angle and dynamic contact angle in 0-60s of diluted solution of 10% difenoconazole water dispersible granule (WG)were determined by using contact angle measuring device and automatic surface tension meter.Effects on wettability of difenoconazole WG with adjuvants (0.4%silwet stik and 0.2%as 100)on litchi leaf surface were also investigated.The results showed that the SFE value of the adaxial surface of litchi leaf was about 23.74mJ/m^2,while the SFE value of the abaxial surface was about 11.89mJ/m^2,and the dispersion component was dominant.The surface tension of 500-fold dilution of 10%difenoconazole WG with 0.4%silwet stik on litchi leaf was 21.90raN/m, while the CST of lichi leaf was 22.64mN/m.The contact angle of WG's 500-fold dilution with silwet stik declined the fastest during 0-10s.The results suggested that the adaxial surface oflitchi leaf was more wettable than the abaxial surface.When 10%difenoconazole WG was applied to lichi trees,the best performance was accheived by 500-fold dilution with 0.4%silwet stik adjuvant.

关 键 词：助剂 silwet stik as 100 苯醚甲环唑 荔枝叶片 润湿性 表面自由能 表面张力 

分 类 号：S482.92[农业科学—农药学] TQ450.45[农业科学—植物保护]