On the Effect of Droplet Adhesion to the Crown by a Sprinkler Type, Nozzle Angles and its Improvement

Study on the spraying of agrichemicals uslng a sprinkler system for citrus groves (II)

Abstract

On the basis of the former report, the adhesion rate for various types of sprinklers were investigated, nozzle angle improvement was carried out and its effect were verified.
The effect of attaching a wire gauze to the sprinkler head to concentrate the spray with a certainarea was investigated. The results are summarized as follows.
Intermediate pressure sprinkler (M) was most adequate for spraying of agrichemicals, and therewas no difference in the efficiency of the chemical adhesion between the MI and M III type.
The nozzle angle determining the spraying velocity and the spraying angle of the droplets wereinvestigated with improvements being made. As a result of experiments on the adhesion efficiency, the most suitable angle was between 15-20° for the M I type, and 18-20° for the M III type. Themost suitable rotational speed of sprinkler head was from 1.5-2.0rpm for the M I type, and 1.0-1.2rpm for the M III type.
The adhesion of the chemical solution which was sprayed from the miniature and high pressuretype sprinkler with a turbine system was less on the back of leaves. However, it was improved bynozzle size and spraying method at intermediate pressure.
Attaching a wire gauze to the sprinkler head was effective in keeping within the boundary of grove, and it was also effective in improving adhesion rate of the chemical solution onto the crown.