Answer: Delayed open-heart shape is also called evacuation stratified shape, small crown sparse stratification shape, and double-layer evacuation shape. It consists of trunk, central main branch, main branch and fruiting base branch. The trunk is about 70 centimeters high (about 120 centimeters for jujube grain intercropping), and the tree is 2.5 to 3 meters tall. The whole tree has 5 main branches divided into two layers, growing on the central main branch. The distance between the main branches within the layer is 15 to 20 centimeters. , the angle between it and the central main branch is 60° to 70°, the horizontal angle between the three main branches at the base is about 120°, the angle between the fourth and fifth main branches and the central main branch is about 70°, and they grow staggered with the third main branch. The layer spacing between the third and fourth main branches is about 1 meter. As a result, the basal branch is attached to the central main branch and other main branches. The basal angle of the basal branch is larger than that of the main branch at the same level, and the growth potential is weaker than that of the main branch at the same level. Shaping method: When the diameter of the jujube tree trunk reaches 2 cm, select strong buds at a height of 1 meter and double-cut the trunk, and thin out 4 to 5 secondary branches under the cut to promote the development of jujube heads. When pruning in the spring and winter of the next year , select the first jujube head under the cut as the central main branch to extend the branch, and select the remaining jujube heads with three growth directions, suitable spacing and angles between the central main branches as the first three main branches. When the diameter of the central main branch reaches 2 cm at a distance of 120 cm from the third main branch, select the strong buds and cut them twice, and thin out 2 to 3 secondary branches under the cutting edge to promote the development of jujube heads. Select the first jujube under the cutting edge. The first head is used as an extension branch of the central main branch, and the remaining two jujube heads with suitable direction, angle and spacing are selected as the fourth and fifth main branches. As a result, the selection of base branches shall refer to the relevant parts of open heart shaping. After the configuration of the fruiting base branches on the fourth and fifth main branches is completed, an auxiliary branch can be left opposite the fifth main branch, and the extension branches of the central branch can be cut off to form a heart-shaped shape. At this time, all the shaping work of the heart-shaped shape can be postponed. Finish. Dried and processed varieties can also be cultivated into a large crown shape, with 7 to 8 main branches in the whole tree, divided into 3 layers, 3 main branches in the first layer, 2 to 3 main branches in the second layer, and 2 main branches in the third layer. The angle between the branch and the central main branch should be smaller than the main branch on the second layer. You can select 1 or 2 more side branches on the first and second main branches. The shaping method is the same as before (Figure 9).

Figure 9 Delayed open-heart tree diagram