Abstract
The aim of the present experiment was to study the relationship between the distribution of relative light intensity in
canopy and yield and quality of Wanmi peach. The optimum relative canopy light intensity was judged to be 36.3% for
high quality peaches, when canopy volumes of Wanmi peach trees with a relative light intensity < 30% accounted for
7.7 and 47.9% of the total canopy volume in June and September, respectively. The canopy volume with a relative light
intensity > 80% was 27.7 and 3.1% of the total canopy volume in June and September, respectively. Peach canopies
were divided into 0.5 m x 0.5 m x 0.5 m cubes, with the relative light intensity being measured at different positions of the
canopy during the growing season. Yield and fruit quality were also measured at these positions at harvest. The results
showed that the relative light intensity decreased gradually from outside to inside and from top to bottom of the tree
canopy. Fruit were mainly distributed in the upper and middle portions of the canopy, 1.5-3.0 m above ground.
Regression results showed that single fruit weight and soluble solid content were positively related to relative light
intensity.