黄瓜叶片喷雾药液持留量试验  

Experiment on Retention of Spray Liquid on Cucumber Leaves

作　　者：陆军[1] 贾卫东[1] 邱白晶[1] 李萍萍[1] 

机构地区：[1]江苏大学现代农业装备与技术省部共建教育部重点实验室/江苏省重点实验室,镇江212013

出　　处：《农业机械学报》2010年第4期60-64,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50975125);国家"863"高技术研究发展计划资助项目(2008AA100904);江苏省自然科学基金资助项目(BK2008229);江苏省普通高校研究生科研创新计划资助项目(CX09B_207Z)

摘　　要：为研究喷雾药液在靶标植株黄瓜叶片上的流失点与最大稳定持留量,以炮塔式压力雾化轴流风送高压静电喷雾系统为试验平台,采用微称量法对其进行了测量。引用润湿方程的基本理论,对影响持留量的因素(喷雾距离、雾滴叶面接触角及施药量)进行了分析,探讨各因素对药液持留量的影响规律。试验结果表明:随着喷雾距离的增加,药液在黄瓜叶片上的流失点和最大稳定持留量先上升后下降,最大值均出现在距离喷头125 cm处;药液雾滴在黄瓜叶片上的接触角θ、粘附张力β、粘附功W_(?)和临界表面张力γ_0的稳定值分别为85.07°、6.17 mN/m、77.97 mJ/m^2、61.23 mN/m;黄瓜叶片持留量在施药量为1.26～3.36 kL/hm^2范围内出现峰值,超过该范围后持留量随着施药量的增加而减少并逐渐趋于稳定。With the aim to study the point of run-off and the maximum retention of spray liquid on cucumber leaves in greenhouse,the spraying experiment was performed with various charged voltage and spray volume.Taking the barbette model pressure atomization axial-flow air-carried high-voltage electrostatic spraying system as the experiment platform,the retention volume on cucumber leaves surface was measured by micro-weighing method.The factors on the retention volume were analyzed based on basic theory of Young＇ s equation,including spray distance,droplet contact angle and spray volume.The results show that with the increasing distance,point of run-off and maximum retention rises firstly and then declines;the contact angleθ,adhesion forceβ,adhesion work W_a,critical surface tensionγ_0 is 85.07°,6.17 mN/m,77.97 mJ/m^2,61.23 mN/m,respectively;the retention volume reaches the peak in spray volume range from 1.26 kL/hm^2 to 3.36 kL/hm^2,and then reduces and gradually stabilizes with the increasing spray volume.

关 键 词：高压静电喷雾 流失点 最大稳定持留量 接触角 施药量 

分 类 号：S481[农业科学—农药学]