Abstract
Agricultural electrostatic spraying can help to reduce the threat of pesticides to human health and the environment. However, the influence of the law of leaf water content on electrostatic spraying has not been studied. In this study, we used leaf water content as an evaluation index of electrostatic spraying technology and verified the correlation between leaf water content and leaf capacitance value by statistical methods in order to achieve in vivo measurements of leaf water content in relation to tomato, pepper, and wheat crop leaves. Using these in vivo measurements of leaf water content and retention, we demonstrate that the retention of electrostatic droplets on the leaves of all three crops increases with increasing water content; the retention per unit area of leaves increased by 6.1 mg/cm2, an increase of 7.29%. Increasing the electrostatic spray voltage (10~30 kV) enhances the retention of droplets on the leaves of the crops, with a maximum increase of 6.1. The retention of non-electrostatic droplets decreases with increasing water content; retention at the lowest water content was 1.103~1.131 times greater than at the highest water content. This study has implications for research related to improving the retention of electrostatic droplets in leaves.
Highlights
Agricultural electrostatic spraying technology is superior to non-electrostatic spraying technology [1,2]
We investigated the effects of leaf capacitance and water content variations on electrostatic spraying technology by varying the water content of in vivo crop leaves, and the leaf capacitance, using leaf retention as a spraying effect evaluation index with reference to three crops as research objects
This paper investigated the positive correlation between crop leaf water content and electrostatic droplet retention, i.e., that the retention of electrostatic droplets on the leaves of a variety of crops gradually de
Summary
Agricultural electrostatic spraying technology is superior to non-electrostatic spraying technology [1,2]. Electrostatic spraying technology is used to charge droplets to induce an electric field on the surface of the crop leaves, adsorbing electrostatic droplets and achieving directional movement of the charged droplets. The attraction of the electric field on the crop surface to the charged droplets can be divided into two cases. The first is the group of charged droplets attracted to the plant surface, which facilitates the target movement of the droplets toward the crop. In the second case, when the droplets are close enough to the crop, the attractive forces are sufficient to overcome the gravitational, inertial and drag forces on the droplets, changing their trajectory and inducing them to move towards the target plant and adhere to its surface, increasing the adsorption force
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