Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, P. R., China.
Pest Manag Sci. 2014 Mar;70(3):462-9. doi: 10.1002/ps.3594. Epub 2013 Jul 25.
A good knowledge in wetting behavior of pesticide spray liquid on plant surface is crucial to spray applications. Difference in leaf surface wettability would result in obvious changes in spray wetting behavior. The aim of this paper is to obtain the changes of wettability during different growth periods.
The contact angle (CA) of rice leaf for each liquid increased with rice growth. No significant difference was found between cultivars. The CA was found to be correlated with the polar component of liquid surface tension. The square of the polar component was also found to be highly significant indicating that the relationship between these two properties was not a simple linear one. The surface energy of each plant surface decreased as the plants aged. This was also true of each part of the surface energy. However, no obvious difference on the proportion of the components was found among different cultivars and stages.
The changes in value of CA and surface free energy (SFE) both reflect the changes of the leaf surface wettability, while the SFE value shows better in wettability characterizing. Obvious rice leaf wettability changes were found on different development stages, which may be beneficial for researches in agrochemical sprays wetting and spreading behavior. Factors influencing these alterations were discussed.
对农药喷雾液在植物表面的润湿行为有很好的了解对喷雾应用至关重要。叶片表面润湿性的差异会导致喷雾润湿行为的明显变化。本文旨在获得不同生长时期的润湿性变化。
随着水稻生长，水稻叶片对每种液体的接触角（CA）增加。品种间无显著差异。发现 CA 与液体表面张力的极性分量相关。极性分量的平方也具有高度显著性，表明这两个性质之间的关系不是简单的线性关系。随着植物的老化，每个植物表面的表面能降低。这也适用于表面能的各个部分。然而，不同品种和阶段之间在组成部分的比例上没有明显差异。
CA 值和表面自由能（SFE）的变化都反映了叶片表面润湿性的变化，而 SFE 值在润湿性表征方面表现更好。在不同的发育阶段发现了明显的水稻叶片润湿性变化，这可能有利于农业化学喷雾润湿和扩展行为的研究。讨论了影响这些变化的因素。
