Spray Deposition and Distribution under Different Canopy Densities based on FCM-R

摘要

To accommodate the narrow space and low canopy of the orchards and improve sprayers applicability to different canopy characteristics, this article aims to investigate droplet deposition and distribution uniformity under different canopy densities. The canopy is extracted from the fruit tree image under the complex background based on FCM-R algorithm firstly and the gap fraction is computed, then, the artificial canopy targets with different densities are selected for spray test, and the droplet deposition and distribution are discussed. Results indicated that the average value of the FCM-R algorithm segmentation SNR is 7.85, and the spray experimental showed that with the increase of canopy density, the trend of droplet deposition in the vertical direction is: middle level > lower level > upper level, the horizontal direction gradually decreases from front to back, and the droplet deposition on the ground decreases first and then increases; the droplet distribution uniformity in the vertical direction of the canopy of the fruit tree decreases with the increase of canopy density, when the gap fraction is 8.83%, the total droplet deposition is relatively small, but the distribution is comparatively uniform; when the gap fraction is 2.14%, the totaldroplet deposition increases, but the uniformity is poor; when the gap fraction is 5.86%, there are more droplets deposited and uniformly distribute, therefore, considering droplet deposition and distribution characteristics, canopy density characterized by a 5.86% gap fraction should be chosen as reference of spraying pesticides.