Deposition characteristics of electrostatic spraying by negative high-voltage corona discharge

Electrostatic spraying is a new technology for improving pesticide deposition to reduce environmental pollution. In this paper, simulative plants were used instead of real plants to perform electrostatic and traditional spraying comparative experiments. The deposition mass and density were measured by colorimetry, gravimetric method and microscope slides counting method respectively both under electrostatic and traditional spraying technology. It was found electrostatic spraying technology provided droplets with much better characteristics of atomization, uniformity, penetrability and attachment. And the deposition mass in electrostatic spraying raised 10%-30% than that in traditional spraying and the deposition density raised 1-2 times. It could improve the distributing characteristic further, especially on the backs and lower leaves. Consequently, the probability of killing insects is increased and the drift of pesticide is reduced greatly. And the most ideal charging voltage is 18-20 kV.