剂型及表面活性剂对农药药液在植物叶片上铺展行为的影响

为研究不同农药剂型及表面活性剂对药液在亲水和疏水植物叶片表面的持留及铺展行为的影响,通过数码显微镜连续摄像的方法,测试了40种药液液滴在棉花(亲水性)和水稻(疏水性)叶片上的持留及铺展行为。选用5%氯虫苯甲酰胺悬浮剂、25%三唑酮可湿性粉剂和20%三唑酮乳油3种不同剂型的农药,以及Silwet 408、NF100和AgroSpred 730 3种不同表面活性剂,配制不同药液,通过注射器产生液滴并用数码显微镜记录液滴在水稻和棉花叶片上的铺展行为。结果表明:农药剂型对药液表面张力影响不显著,但加入不同表面活性剂却对表面张力影响显著,其对降低表面张力影响的显著程度依次为Silwet 408AgroSpred 730NF100;同种表面活性剂对悬浮剂的影响最大,其次是可湿性粉剂,对乳油的影响最小;加入NF100可增加药液液滴在水稻叶片上的持留能力。结合表面张力结果,证明表面张力并非增强药液持留和铺展能力的唯一因素。

Effects of formulations and surfactants on the behavior of pesticide liquid spreading in the plant leaves

In order to study the effects of different formulations and surfactants on the adhesion and spreading behavior on hydrophilic,hydrophobic leaves,the adhesion and spreading behavior of 40 kinds of different pesticide solution on cotton and rice leaves were investigated.Three different pesticides and three kinds of adjuvant were used in the experiment,which were chlorantraniliprole 50 SC,triadimefon 250 WP,triadimefon 200 EC and Silwet 408,NF100,AgroSpred 730,respectively.The spreading behavior of different pesticide solution droplets on two crops leaves was recorded by using digital microscope.The results showed that the effect of different formulations on surface tension of the pesticide solution was not significant,but the effect of different adjuvant was significant.The impact of Silwet 408 was the most significant,followed by AgroSpred 730,the last was NF100.The same adjuvant showed different effect on different formulations,the largest impact was found on SC,followed by WP,the minimum impact was found on EC.NF100 could increase the liquid droplets retention capabilities in rice leaf.The results suggested that surface tension was not the only factor to increase the holding and spreading of droplets on the leaves.