Profile modeling of spray parameters of chemical solution application to fruit tree

In order to make a systematical analysis of the parameters and droplet distribution quality of profile modeling spray, a profile modeling spray experimental equipment was designed and manufactured indoors. During the experiments, the spray pressure was adjusted by rotate speed of spray motor which was controlled by frequency converter, and the spray distance was adjusted by the relative position of test frame and profile modeling fruit tree, while the spray time is limited by a timer. The orthogonal experiments were conducted for the profile modeling spray with different spray parameters combination. The entire distribution of spray droplets was evaluated by Coefficient of Distribution Quality. The results showed that under the indoor environment, spray distance was the main factor to affect the distribution quality, and the spray pressure was second, but the effect of spray interval was not significant. Deposition of droplet in the fruit tree falls significantly when the spray distance exceeds 80 cm, and the increase of spray pressure can improve the distribution uniformity of spray droplets under the condition that the spray distance was less than 50 cm.