Surface free energy is an important parameter reflecting the wetting properties of target plant leaves.Using water and diiodomethane as test liquids,the surface free energy,dispersion component and polar component of the leaves of 12 plant species such as sugarcane,amaranthus spinosus and maize were measured by the OWRK(Owens-Wendt-Rabel-Kaelble)method.The results showed that the surface free energy and its component magnitudes of the target plant leaves vary from plant to plant,and even there are differences in the surface free energy between the adaxial and abaxial surfaces of the leaves in the same plant.When the surface free energy of the leaves is larger and the proportion of the polar component is greater,the wetting performance of the leaves is better;otherwise,it is worse.This method is simple and fast,and can be applied to the research on the wetting and spreading behavior of pesticide liquid on the surface of target plant leaves as well as the research,development and application of pesticide formulations and tank-mix adjuvants.
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