1, lifelong conflicts. That is, the contradiction between growth and results. It runs through the entire life cycle of the fruit tree and shows how powerful the tree is and how much it results. The law of inheritance determines that all measures that the saplings are incapable of achieving results are achieved by weakening the tree.

2, two power. In other words, light and water, light is the energy source, which determines the nutrition and accumulation level of fruit trees. Water is the lifeline and determines the growth force of fruit trees. As the saying goes, “It is good to have a good tree on the waterway and good results on the light path.” This is the truth. The fruit tree pruning must first consider the soil fertilizer conditions and the scenery conditions. The individual and group structure of fruit trees can only achieve the best results when they are consistent with ecological conditions.

3, two advantages. That is, the vertical dominance and the top dominance are the upward and upward tropisms expressed during the growth of fruit trees. This is the principle that all fruit trees can grow taller and grow bigger. In the fruit tree pruning process, adjusting the balance between the upper and lower canopy, external and internal growth results, in essence, is to adjust the relationship between these two advantages.

4, two angles. That is, the angle of the backbone branches and the angle of the upper branches of the backbone. The angle is the "key" for adjusting the optical path and the waterway, adjusting two advantages, and achieving the coordination of growth and results. From small to large angles, the tree vigor changes from strong to weak; vice versa, the angle changes from big to small, and the tree vigor changes from weak to strong. The most effective measures for early fruiting of young trees are to cut light long and open angles. The old tree relies on using the back and raising the angle.

5, two parts. That is, the upper part and the lower part of the earth are crowns and roots. The two parts are closely related. In the annual growth cycle of fruit trees, the two parts are in a state of dynamic equilibrium. To some extent, the tree crowns are trimmed. The more cuts are made, the stronger the forces that promote canopy restoration are. The branches are sheared, rely on the roots, and the root system is damaged, which will inevitably affect the growth of the crown.

6, two roads. That is, the two paths of moisture and organic nutrient transfer process. The moisture and inorganic salts absorbed by the roots are transported through the xylem conduits to the canopy; the organic nutrients produced by the blades are transported through the cortical screens to the roots. The use of ring-skin peeling and other measures to increase fruit set rate, promote flower bud formation and "severe bone damage" (damage of xylem) to weaken and prolong the vigorous growth of trees are all due to the destruction of the normal functions of the two roads. To achieve the intended purpose.

7, two centers. For the above ground, the organic nutrients produced by the leaves during the growth period of fruit trees have two centers in the distribution process: they are transported to the tip of the most active new shoot for growth, and they are transported to the resulting part for fruit. Grow. The transfer of nutrients to the center of growth will result in overheating of the tree vigor; the transfer of nutrition to the center of the result (too much fruit set) will cause the tree vigor to be too weak. One of the main tasks of pruning is to regulate the distribution center of organic nutrition so that the growth and results are coordinated and appropriate.

8, two growth stages. The growth of new shoots in the annual cycle is generally divided into spring shoots and autumn shoots. Spring shoots, also known as bud shoots, play a decisive role in the nutritional status of fruit trees in the early period, and they are cumulative shoots. Autumn shoots grow after the rainy season and are not conducive to fruit growth and flower bud differentiation. They are consumptive shoots. For young Wangshu trees, they can make full use of the autumn shoots to achieve the purpose of expanding the canopy with light shear and long stay. For the big trees, how to control and weaken the growth of autumn shoots is one of the tasks of the plastic trimming.

9, two ways. That is, short cuts and thinnings are cutting branches or removing them from the base. This is the two basic techniques in fruit tree pruning. The short cuts are divided into light, medium, heavy, and extremely heavy cuts, which all have a helping hand to the pruning branches. For the same branch, the shorter the heavier, the stronger the role of local assistance, the smaller the amount of growth. The shorter the cut, the weaker the partial helper action, the greater the amount of cut growth. Shearing has reduced the effect on the upper part of the cut, but it has a promoting effect on the part below the cut. Only the proper combination of these two techniques can achieve the desired pruning effect.

10, combination of winter and summer. That is, winter pruning is combined with summer pruning. For young trees and early fruit trees, pruning in winter alone will often result in excessive pruning. In the following year, too many springs will result in late results. If winter is lightly cut, in the summer, it will be wiped, stripped, stripped, twisted, pulled, carved, etc. The method will speed up the formation of the crown, early flowering, early results. The greater the amount of pruning after the fruit has germinated, the heavier it will be to the tree's "strength". Therefore, summer pruning and pruning should minimize the losses of the leaves and achieve the purpose of governing, slowing, early flowering, and early fruiting.

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