The Technique Research Of Modifying Canopies On Densely Planted Apple Trees

The weibei loess is one of the advantage districts that apple production in china. the apple production has become the predominant industry of the native farmer through more than 20 years Development.1,The most suitable tree form is open center shape for arboreous and the most suitable tree form is slender spindle for dwarf tree on weibei losse plateau region.If you chose the appropriate tree-training system ,Under the same condition, you will got the high-yield and high-quality.2,thinning tree could improve Apple Orchards cover degree,Total Amount branch Number and could improve the tree vegetative growth and leaf quality。The length of branches,The diameter of branches ,the leaf fresh weight, the leaf thickness is increased by 28.6%,82.1%,35.8%,36.4%over the control For theNo1 treatment . The length of branches,The diameter of branches ,the leaf fresh weight, the leaf thickness is increased by 20.6%,51.3%,23.4%,13.4%over the control For theNo2 treatment. the photosynthetic rate of the apple tree leaves for the treatment is higher than the ck.3,Generally speaking ,apple tree Thinning can not only increase the yield,but also Improve the Quality.Experiments showed that the yield is decrease in the first year of treatment 1,From the following year of Thinning,the yield will increase.the yield Is increased year after year during the 3 years Experiments For treatment 1, accumulative yields of 3 year for treatment 2 was the higest of three,it was 5884.5kg,accumulative yields of 3 year for treatment 3 was the lowest of three,it was 4909.1kg.the first grade apple rate and mean fruit weight of three year average for treatment 1 is 74% and 237-252g,and the first grade apple rate and mean fruit weight of three year average for treatment 3 is 30% and189-214g.4,Modifying Tree form has decrease the number of the total branch number and could improve the rate of middle-branch ane short-branch,The exprimental results show that the percentage of loner branch for treatment 1 is 40.9 percent lower than treatment 2.But the percentage of shot branch is 28.0 percent higer than treatment 2. floral bud percentage of the lower part of the tree is increased 138.6% and floral bud percentage of the inner part of the...