Fig. 32 Wall shape of apple hedge
The characteristics of this tree form are: when young trees are planted, two trees are planted in each hole in the anterograde direction, and the distance between the two trees is 20 cm. The upper branches of the two trees cross each other to form a crown, which has two trunks. The trunk is about 70 cm high, and the whole tree is divided into three layers and six main branches, the spacing between layers is about 50 cm, and the crown height is 1.7 ~ 2.0 meters.
When this tree shape is adopted, it is necessary to select large seedlings with a height of more than1.2m for planting. It is not necessarily dry after planting, but at the height of 70 cm, the tips of two young trees are bent horizontally as the backbone branches of 1 layer; At the corner of two small trees, they can also send out strong and straight branches. In autumn, these two thick and upright branches cross and bend horizontally about 50 cm away from the main branch of 1 layer, becoming the main branch of the second layer; In the second spring, strong new shoots will appear at the bending parts of the second layer of backbone branches. In autumn, the second layer of backbone branches is produced according to the above method. If the planting density is small or the soil layer is thick, the fourth layer of backbone branches can be selected as usual.
This kind of tree has two plants in one hole, two stems and one crown, so the root system in the underground part is relatively large, the absorption range is wide, the aboveground part is prosperous, and the branches and leaves are large, which is easy to be premature. If the upper part is cut off and the branches are reshaped according to the old method, the molding time will be delayed. However, this method can make full use of the branches above the fixed stem as the first layer of main branches, which not only makes full use of the new shoots of seedlings, but also accelerates the formation of young trees. According to the conventional plastic surgery method, it usually takes three years, and this plastic surgery method can be completed in two years. Because this kind of branch has many leaves, it forms quickly and is easy to obtain early high yield.
In addition to the above trees, there are fan-shaped, palm-leaf-shaped, triangular, free-form and tufted. These trees are characterized by large branches and few branches, small crown and many branches, which are suitable for close planting and easy for early high yield. In production, it can be selected and applied according to different site conditions, rootstock types, variety types, planting density and management technology level.