氟虫腈药液在水稻叶片上的沉积特性研究

以氟虫腈悬浮剂为研究对象探讨了药液在水稻叶片上的沉积特性。随着雾流方向角增大,药液在稻叶上的沉积量显著增加,雾流方向角为30°、45°与60°处理时药液的沉积量分别比0°处理者提高了16.6％、39.3％与70.1％。随着雾滴体积中径(VMD)增大,氟虫腈药液在稻叶上的沉积量降低,VMD为157.3、193.2、215.4、233.7 μm 处理的药液沉积量分别比VMD 149.5 μm处理降低了16.2％、39.1％、49.5％与66.4％。施药液量少于339 L/hm2时,药液在稻叶上的沉积效率较高,为25.6％ ~28.1％,药液在稻叶上的最大稳定持留量约为 1.42 μL/cm2。较少施药液量和较小雾滴的处理,加入有机硅(150 g/hm2)后药液的沉积量可提高80％ ~150％,但施药液量增加至694.5 L/hm2 (VMD 233.7 μm)时,药液沉积量未增加。根据本实验结果,施药时采用较小雾滴和较少施药液量,雾流方向角45°~60°,并加入有机硅作为喷雾助剂,药液在稻叶上的沉积效率较高。

Characteristics of Fipronil Solution Deposition on PaddyRice (Oryza sativa) Leaves

Characteristics of fipronil solution deposition on leaves of paddy rice (Oryza sativa) were studied. Deposition of fipronil solution on rice leaves increased significantly with the increasing of nozzle orientation and with the decreasing of droplet size. Deposition of fipronil solution on rice leaves treated with spray angle of 30°,45° and 60°,increased by 16.6％,39.3％ and 70.1％ comparing to that on vertical leaves,respectively. Deposition of fipronil solution treated in droplet size (VMD) of 157.3,193.2,215.4 and 233.7 μm decreased by 16.2％,39.1％,49.5％and 66.4％ comparing to that treated in smaller droplets of VMD 149.5 μm. Approximately 25.6％ to 28.1％ of the solution applied was deposited on rice leaves when treated in a spray volume less than 339 L/hm2,while it declined greatly in higher spray volume. The maximum retention of the solution on rice leaves was approximately 1.42 μL/cm2. As a function of organic silicon applied as spraying adjuvant at the dosage of 150 g/hm2,deposition of fipronil solution on rice leaves was improved by 80％~150％ comparing to that without the adjuvant in treatments of smaller droplets and less spraying volume combination,however,it wasn't increased when treated in combination of large spray volume (694.5 L/hm2) and coarse droplets (VMD 233.7 μm). The results indicated that,the deposition of pesticide solution on rice leaves would be improved greatly if it's applied in relatively small droplets and less spraying volume in spraying angle of 45°~60°,and by adding of organic silicon as spray adjuvant.