1, the grafting of hawthorn seedlings mainly adopts bud grafting. The method is as follows: 1. Take bud pieces from hawthorn scions and cross-cut them to xylem 0.5 cm above the bud grafting position; Then cut the two sides of the bud into triangles and break it off.

2. At the place where the rhizome is 3-6cm away from the ground, select the smooth side and cut a knife with a length of about 1 cm, and cut down the vertical mouth of 1 cm in the middle of the horizontal mouth to form a "D" shape.

3. Then, pry up the cortex on both sides with a knife tip, then insert the bud, so that the incision on the bud piece is closely connected with the transverse incision of the rootstock, and then tie it tightly with plastic strips.

Second, the hawthorn trees planted must use grafted seedlings. After sowing wild hawthorn seeds, when the seedling growth diameter reaches more than 0.5 cm (5 cm above the ground), the tender buds of excellent varieties are grafted from July 20 to August 20. It can also be split with hard branches or grafted with hard buds around Qingming in the next spring.

3. Cutting propagation of root segments: collecting the cut roots obtained when the seedlings leave the nursery or the orchard are fertilized and ploughed. The root with a diameter of 0.4~ 1.0 cm was cut into root segments with a length of 12~ 15 cm, and the cutting was carried out in spring. When cutting, the soil should be compacted while inserting roots, so that the root segments are close to the soil. Then when watering, add 3-5 kilograms of Fuyuan planting bacteria liquid per mu to keep moisture. After germination, the extra buds are removed in time, and only the strong buds of 1 grow, and the varieties are grafted in autumn.

Extended data:

1. Crataegus pinnatifida is a shallow-rooted tree species. Its taproot is underdeveloped, but it has strong growth ability and can grow in barren mountainous areas. The lateral roots are shallow, mostly distributed in the soil layer 30 ~ 60 cm below the surface, and the deepest part can reach 90 cm. There are few roots in the soil layer above 10 cm and below 90 cm. Lateral roots are mainly distributed in the soil layer of about 40 cm, and the horizontal distribution range of roots is about 2 ~ 3 times that of crowns.

2. After the hawthorn seedlings were planted, the roots came out late that year. Therefore, the growth on the ground was weak in the first year of colonization, and it became stronger after the seedling was delayed in the second year, and then it became stronger every year. But when pruning, you should not throw it away or even cut off the extended branches just because it is growing vigorously, which will affect the firm structure and skeleton of the tree and the reasonable distribution of branches. Although it may bear fruit early, it has a small bearing area and low yield.

3. Adventitious buds often occur in the root system of hawthorn, forming tillering seedlings, and most of them occur in the surface soil of 5 ~ 20 cm. Can be used for seedling raising or regeneration.

References:

Baidu encyclopedia-hawthorn tree