In fruit cultivation, this phenomenon is often encountered. Some fruit trees such as apples, pears, plums, etc., have self-nutrition. Even if they can self-fruit, the result rate is very low. There are also some species of fruit trees that can self-sufficient in some areas but cannot be self-sufficient in other regions. This shows that the external conditions are one of the main reasons for self-cultivation. It has been proved that disposing pollination trees within a self-contained variety garden will greatly increase the yield of fruit trees. First, configure pollination tree requirements 1. Select the pollination tree must be consistent with the main cultivars flowering period. 2. Cannot interact with the pollen tree of the same strain, such as GuoGuang and HongGuangGuang, JinCuan and its short-branch species, the Marshal's breed (Marshal, Red Crown, Red Star, etc.). These varieties have the same source. Similar to self-pollination, it does not work as a pollination tree. 3. Requires no inbreeding of the pollinating tree and the main varieties. 4. It is required that the pollen tree be similar to the main varieties in terms of life span, and it should ensure flowering every year. 5. In order to facilitate management, it is better to use the varieties with higher economic value in the pollination tree, and the mature periods of the two are the same or consecutive. Second, the way to configure the pollination tree The role of the pollination tree depends on the distance. Generally, the pollination effect is closer to the main cultivar. According to the study on the pollinators of fruit trees, the distance between pollinated tree species and the main cultivars should not exceed 50 to 60 meters. There are many ways in which pollination trees can be arranged in an orchard. In a small orchard, a central planting method is often used to ensure that there are 8 to 10 main varieties planted around a pollinated tree. The allocation of pollination trees in large orchards should be planted in rows and columns in the direction of the long side of the plot. For example, apples and pears in pome fruit should be planted in 4 to 8 rows and 1 line to pollinate trees; Li and Hing in stonefruit should be planted in rows of 3 to 7 to conduct 1 line of pollination trees. Under conditions where the growing conditions are not very suitable, for example, where there are often high winds in the flowering season and the number of rows between pollen trees and pollinated trees in the high mountain belts is preferably less, and in the ecologically optimum belts of fruit trees, the intervals of pollination trees are The number can be more appropriate. In the terraced slopes, one row of pollination varieties can be planted at intervals of 3 to 4 rows of terraces. When the economic value of the pollination variety and the main cultivar is the same, an equal amount configuration method can be adopted, and the number of rows of the pollination tree and the main variety should not be more flexible than the pollination range.