The dry-week method is used for normal management, complete tree body, and non-aging tree. The number of remaining fruits of the whole tree is determined according to the length of the stem circumference in the middle of the trunk. The formula is: Number of fruits to be retained per plant: 0.2 × stem circumference × stem circumference. For example, if the circumference of the trunk in the middle of the tree is 30 cm, substitute the above formula, and the number of fruits per plant: 0.2 × 30 × 30 = 180 (each fruit). In order to prevent accidental injury, an additional 10% insurance factor should be added, then the actual number of fruits per plant: 180 + 18 = 198 (each fruit).
The distance method operation is easy to master. Red Fuji apples keep 1 fruit every 25 cm or so, and strong trees and weak branches keep 1 fruit every 25 to 30 cm. The fruits are evenly distributed. However, it is easy to stay in practice. It is more reasonable to use the dry cycle method to determine the total tree load.
Thinning flowers and fruits
Thin the large tree first, then the small tree; thin the weak tree first, and then the strong tree; thin the flower first, the number of trees with more fruit, then thin the tree with less fruit, then thin the backbone branches first, then thin the auxiliary branches . On a tree, thin the upper part first, then the lower part; first the inner bore, then the outer part; first axillary flower buds and deformed flowers, then top flower buds. During the operation, follow the order and progress step by step to prevent omissions.
Don't be stubborn about sparse flowers and fruits
According to the tree vigor and branching strength, the strong ones keep more flowers and fruits; the weaker ones keep less flowers and fruits; the common type trees keep more middle and long fruit branches; the short branch type trees have more branches and fruits with a certain axis length. Flowers and fruits that do not leave axillary flower buds.
According to the suitable load, leave flowers and fruits under bad weather conditions. There should be room for thinning flowers and thinning fruits. Generally, the insurance factor is 15% to 20% more than the suitable retention. Set the fruit again when bagging, and the amount of fixed fruit should be 5% to 10% more than the appropriate reserve. At the same time, single fruit, central fruit, large fruit, straight fruit, drooping fruit, evenly distributed fruit should be selected, and disease and insect fruit, malformed fruit, dense fruit, small fruit or misdirected fruit should be removed to make the fruit on the tree an appropriate amount And high quality.
In principle, the principle of fruit retention on a single plant or a single branch is to keep fewer backbone branches and more auxiliary branches; more strong branches and weak branches; less inner bore and more outer circumference; less or no backbone branches; 1 Leave the branches before and after thinning, so as to retract and update later. After adjusting the load of the whole tree, carefully review it to prevent leakage.
The choice of fruit branches generally does not leave "Chongtian fruit" (called inverted fruit), because this fruit is easy to be blown down by the wind, its coloring is limited to the calyx end, and the back of the fruit is easily cracked. In addition, the fruits growing on the fruit branches behind the backbone branches should be removed because of their weak development, less light exposure, and poor coloring. The flowers and fruits of axillary flower buds should be removed except for young trees or frozen trees.
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