Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

Jiantao Zhang; Tengyuan Zhou; Jiajun Zeng; Xuanchun Yin; Yubin Lan; Sheng Wen

doi:10.1584/jpestics.D21-068

Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces

J Pestic Sci. 2022 May 20;47(2):59-68. doi: 10.1584/jpestics.D21-068.

Authors

Jiantao Zhang^{1

2}, Tengyuan Zhou^{1

2}, Jiajun Zeng^{1

2}, Xuanchun Yin^{2

3}, Yubin Lan², Sheng Wen^{2

3}

Affiliations

¹ College of Mathematics and Informatics, South China Agricultural University, Guangzhou 510642, China.
² National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China.
³ Engineering College, South China Agricultural University, Guangzhou 510642, China.

Abstract

The effects of external factors such as temperature, humidity, pesticide formulation, and pesticide concentration on the contact angle of pesticide droplets on rice leaf surfaces were analyzed. The experiments showed that there were significant differences in the contact angles of droplets on the leaf surfaces under different temperatures and humidity. As the ambient temperature increased, the contact angle first decreased and then increased, reaching a minimum value at 25°C. With a gradual increase in humidity, the contact angle significantly increased and reached a maximum at 100% humidity. Finally, it was concluded that both the formulation and concentration of the pesticide had a significant effect on the contact angle of droplets on rice leaf surfaces. The experiments also illustrated that the effects of the pesticide formulation and concentration on the contact angle were more significant than those of temperature and humidity.

Keywords: contact angle; humidity; pesticide concentration; pesticide formulation; rice leaf surfaces; temperature.

© Pesticide Science Society of Japan 2022. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) License (https://creativecommons.org/licenses/by-nc-nd/4.0/).