Variation characters of droplet coverage area in leaf droplet water uptake process
GAO Jian-Min-1, 2 , AN Gui-Ren-1, LIU Chang-Jian-1, HUANG Gui-Zhen-1
(1.Key Laboratory of Modern Agricultural Equipment and Technology，Ministry of Education & Jiangsu Province，Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.USDAARS, Application Technology Research Unit, Wooster, OH 44691, USA)
Abstract：In order to provide useful data for theoretical investigations into aeroponics, foliar fertilization and plant protection equipment development, the process of plant tissue absorbing droplet was conducted. A chamber with controlled environment (100% relative humidity and 20 ℃ temperature) was designed to observe the change in the coverage area of a droplet on a leaf with time. To eliminate the influence of droplet evaporation, three droplets respectively with 238.77, 229.92 and 212.60 μm diameters were employed to verify droplet evaporation rates. The evaporation rates of three droplets were 1.43%, 2.8% and 3.1% at the interval of 600 s respectively. Two droplets with the diameters of 340 and 540 μm were employed to conduct the droplet foliage uptake experiments. The experimental outcomes suggest that the change rate of coverage area of droplet depends on the position where a droplet is dripped and the time elapsed when the droplet is on the foliage.
高建民, 安贵仁, 刘昌鉴, 黄桂珍. 叶片吸收雾滴过程中雾滴覆盖面积的变化规律[J]. 排灌机械工程学报, 2012, 30(2): 198-202.
GAO Jian-Min, AN Gui-Ren, LIU Chang-Jian, HUANG Gui-Zhen. Variation characters of droplet coverage area in leaf droplet water uptake process. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(2): 198-202.
参考文献(References)［1］Yu Y, Zhu H, Frantz J M, et al.Evaporation and coverage area of pesticide droplets on hairy and waxy leaves［J］.Biosystems Engineering, 2009,104(3):324-334.［2］Yu Y, Zhu H, Ozkan H E.Evaporation of pesticide droplets on surfaces under various relative humidity conditions［J］. Journal of ASTM International, 2009,6(1):1-8.［3］Xu Linyun, Zhu Heping, Ozkan H E, et al. Evaporation rate and development of wetted area of water droplets with and without surfactant at different locations on waxy leaf surfaces［J］. Biosystems Engineering, 2010,106(1):58-67.［4］Wang C J, Liu Z Q. Foliar uptake of pesticides—Present status and future challenge［J］. Pesticide Biochemistry and Physiology, 2007,87(1):1-8.［5］Liu Zhiqian. Effects of surfactants on foliar uptake of herbicides—A complex scenario［J］. Colloids and Surfaces B: Biointerfaces, 2004,35(3／4):149-153.［6］Liang Xi, Su Derong, Yin Shuxia, et al. Leaf water absorption and desorption functions for three turfgrasses［J］. Journal of Hydrology, 2009,376(1／2):243-248.［7］张振磊. 基于数字图像的雾滴沉积分布试验研究［D］. 镇江：江苏大学农业工程研究院, 2009.
