Suitable for making heart-shaped trees. Shifeng is an excellent variety with good ear and strong ability to form female flower buds. After the mother branch is cut short, the lateral buds have a strong ability to produce fruiting branches. Short cutting and retraction pruning can be appropriately increased to promote the regeneration of branches in turn and control the crown migration speed. Continuous heavy and short cutting of strong branches from June to August can increase the number of branches and promote the formation of female flowers. After fruit setting, leaving 4 ~ 5 buds at the front end of the fruit can not only promote the expansion of young fruit, but also not affect the continuous fruiting ability of fruit branches.

(2) Iron particle head

Suitable for making open hearts and delayed open hearts. When modeling, leave more branches and trim them lightly. Cutting strong branches continuously from July to August can promote more flowers and fruits, and cutting strong branches from June 5438+00 to June 5438+02 can promote the development and enrichment of lateral buds below the cutting mouth, and produce fruit branches in the following year. Due to the strong ability to form female flower with iron head and many fruits, the fruit of adult trees is obvious in different years, and the nut size is quite different. When pruning, we should pay attention to adjusting the balance between growth and fruit, controlling the number of mother branches and fruit branches in the New Year, and properly thinning some small cones when there are too many fruits to reduce the variation range of annual output and improve the commodity value of nuts.

(3)9 species

The main branch angle is small, the crown is upright and the dryness is obvious, so it is suitable to choose the evacuation layered tree. Young trees have long Yi Bai, so they should be cut lightly and the angle of main branches should be increased appropriately to weaken vegetative growth and promote early fruit. When pruning, the number of strong mother branches should be more, and it is advisable to leave 12 ~ 14 per square meter of crown area.

(4) Yanshan Hongli (Hong Yan)

This variety should adopt a tree shape with low dry change and trunk shape. After the seedlings are planted, the stems are fixed at the height of 60 ~ 70 cm, leaving four main branches, and the main branches are scattered on the middle stems. The young trees of this variety grow vigorously, so the method of coring after heavy cutting or medium cutting can be used to slow down the growth potential, promote branching, increase the amount of branches and leaves and bear fruit early. For the upright flourishing branches, the method of stretching and flattening is adopted to make them sprout new buds and cultivate into fruiting branches. For 3 ~ 4 fruiting mother branches born on the same branch, the method of contraction is adopted to make them rotate to bear fruit, and the branches rotate and update, so as to maintain the continuous fruiting ability of the fruiting mother branches.

For mature trees, cross branches and overlapping branches should be cut in time. If the bare perennial branches are in the proper position, they should be shrunk to the 2-3-year-old parts, and then the sprouted new shoots should be cored for 2-3 times to cultivate about 2 fruiting branches, and all the other new shoots should be thinned.

The weak branches on the third and fourth main branches are all thinned. Keep the opening angle of the four main branches and the length of the main branches to keep the crown shape small.

(5) chestnuts

This variety is suitable for breeding delayed happy trees. After the seedlings are planted, they are fixed at the height of 60 ~ 80 cm in the second year, and are shaped according to the plastic method of delaying the opening of the trunk.

The young trees of this variety have vigorous vegetative growth, large growth of new shoots and easy white growth. When pruning, the buds should be smeared at the right time and the opening angle of the main branches should be appropriately increased to slow down the growth potential, promote branching, form early and promote early fruiting. Before the variety enters the full fruit stage, it should be lightly cut to remove weak branches, cross branches and overlapping branches. Results when the number of fruit branches produced by mother branches is large, the scaling method should be adopted. The pruning amount of adult trees should be controlled to leave 10 ~ 12 thick fruiting mother branches per square meter of crown area, and they should be evenly distributed.

(6) Red light

In the second year after young trees are planted, they are cut off at the height of 50 ~ 60 cm, and 2 ~ 3 new shoots are selected as main branches for cultivation. At the same time, young trees are picked 2 ~ 3 times in summer to increase the amount of branches and leaves and make young trees bear fruit early.

It is more suitable for mangrove to be heart-shaped or trunk-shaped. The fruiting mother branch of mature fruiting tree has strong continuous fruiting ability, and for longer branches, medium, light and short cutting are adopted for retraction; The long branches with weak growth potential are shrunk to 2 ~ 3 years old parts, and then the core is removed in summer to cultivate two fruiting branches.

Trees in full fruit period can adopt comprehensive pruning methods such as light, medium, heavy and slow, and strong branches can adopt two-thirds pruning method of "ignoring one-third of fruits, cutting one-third of fruits and preparation, and re-cutting one-third of sprouting branches and preparation branches". However, this method must be adopted according to the age of the tree, the tree potential and the management conditions of soil, fertilizer and water, on the premise that the number of bearing mother branches is sufficient and there are 8 ~ 10 strong branches per square meter of crown area.

At the beginning of June, red light nuclear removal has a good effect on promoting branching and secondary fruit.

(7) Jinfeng

The tree is stout, strong in resistance and wide in regional adaptability. It is very easy to form female flowers, bearing early fruits and high yield. Strong branches, strong branches. Basal buds have strong seed setting ability and are resistant to short shearing. Strong, medium and weak fruiting branches can bear fruit, and there are many female flowers, which often leads to too many fruits. Results The influence of new shoots was quite different, with a large number of fruits and unstable chestnut size.

The key point of pruning this variety is to balance the strength of new shoots. No fine mother branches are left in the young and adult stages. In the young tree stage, the method of wiping buds can be used. After germination, 4 ~ 5 buds are left on the strong branches and 2 ~ 3 buds are smeared on the weak branches to reduce the number of branches. Results The pruning degree of mother branches and developing branches should be light, so as to increase the number of hair branches, disperse the growth potential, avoid excessive stimulation and produce strong branches, and mature trees can appropriately increase the degree of short cutting. Results the selection and retention of mother branches should be stricter than other varieties to ensure the consistency of thickness and length, and the differences caused by different growth parts can be adjusted by fruit thinning measures

(8) Haifeng

Early fruiting, high yield, the phenomenon of vigorous growth of young trees is not obvious, and the trees are robust and stable. Strong branches, strong mother branches, big and full buds before fruit. Basal buds have strong fruiting ability. This variety is characterized by high density of fruiting mother branches. For example, compared with jinfeng, both varieties are easy to form female flowers, and the number of female flowers is large. The weight of a single seed is also about 8 grams, and the seed setting rate is similar, both of which are about 80% (2.4 seeds per canopy). The number of female flowers per mother branch of Jinfeng is 5.28, and that of Haifeng is 3.68. Therefore, Haifeng pruning must pay attention to the reasonable number of fruiting mother branches, and the number of big branches should be less.

(9) Song Jiazao

Strong growth potential, thick and long branches and small branching angle, so the crown is highly rounded. Premature. High yield, the number of fruiting branches per unit fruiting mother branch and the average number of fruiting branches are higher than those of ordinary varieties, which are 2.9 and 2.6 respectively, which are obvious characteristics different from other varieties. When pruning young trees, we should pay attention to limiting the rapid expansion of the crown. We can use the method of local retraction of lateral branches to alternately retract branches in different parts of the crown. Adult trees are weak and have high crown rate. To keep the tree strong, remove the weak mother branches and other weak branches and keep the strong mother branches. Because of the average crown height of each mother branch, the residual amount of mother branches is less than that of general varieties, otherwise, not only the empty crown rate increases, but also the chestnut is small and irregular.

(10) Taian thin shell

In the young tree period, the growth potential is vigorous, the tree posture is upright, and after a large number of fruits, the tree potential is relaxed, and the crown is high and round. The fruit is a little late, the yield is high and the quality of chestnut is good. Fertility tolerance. Strong branch formation, heavy and short pruning in young tree stage, large amount of new shoots and strong growth potential. Therefore, heavy and short pruning can leave more buds to spread its growth potential. There are few pumping branches after coring. The leaf order of this variety is 2/5, and several branches with similar growth potential often sprout from the top of the mother branch. If one of them is cut short, three or four bifurcated branches will grow. Therefore, 1 ~ 2 tips of the same group of parent branches can be thinned out, leaving the parent branches with large terminal branching angle and moderate branching potential. Open the angle by flattening the big branches. Adult trees should pay attention to controlling tree potential and maintaining moderate tree potential in order to achieve high and stable yield. The number of mature plants per mother branch is moderate (4. 18), but the empty crown rate is extremely low (99.7% in the same garden, 93% in the bottom plate, and only 0. 1% when the red chestnut is 20%), and the seed setting rate is very high (2.8 chestnuts per crown on average). Therefore, the cutting amount of mother branches should not be too much.