We can see that droplet deposition density in the
middle layer was effectively improved with the open
center shape, but the droplet deposition density of the low
layer was still significantly lower. The open shape
canopy greatly raised the level of droplet distribution in
the citrus canopy and the droplet deposition density of the
middle canopy increased by 49.92%. However, the
coefficient of variation on the open shape canopy is larger
than that of the round shape canopy. The results reveal
that the fluctuation and dispersion of droplet deposition
density is larger and the uniformity of the droplet
deposition distribution still needs to be improved.
These results suggest that the open center shape citrus
tree is suitable for UAV spraying in the process of
production management, but the larger fluctuation and
dispersion data show poor uniformity. These
consequences may be linked to the tree structure
modifying that is difficult to maintain higher standards
and unity. The standard and the unity of the open center
shape crown are still to be improved