Effects of modifying tree form on photosynthetic ability and fruit quality of red Fuji apple

The effects of modifying tree form on photosynthetic ability and fruit quality were studied with 10 year old Red Fuji apple/M26.The results showed that the photosynthesis strengthened,the net photosynthetic rate rose,the net photosynthetic yield increased and the fruit quality improved with reducing of shoot number per hm 2.However,if tree forms were modified heavily,the shoot number per hm 2 left less,there was a decreasing tendency with the net photosynthetic yield and the improvement of the fruit quality was not distinct.The first idea on modifying tree form was cut one every two trees,major low branches kept 60-80 cm high,and good to keep 650-700 shoots per tree.Otherwise,the major low branches should keep 80-100 cm high and the shoots number keep 350-500 per tree for intermediate cutting.After modifying tree form,its better to keep 600-900 thousand shoots pre hm 2.