Key points of large branch cutting propagation technology of cherry blossom

Cherry blossom propagation, in the past, cherry was generally used as rootstock for branch grafting in spring, but this method is more labor-consuming and material-consuming, and is not suitable for the rapid development of landscaping. In recent years, we have carried out large-branch cutting propagation and seedling breeding, and achieved good results.

1. Selection of cuttings

Select a young and sturdy mother tree, in the middle and upper periphery of its crown, cut off one-year-old stout branches, retain the top tip, cut into cuttings 30-40 cm long, and cut into an oblique mouth in the lower part. The cuttings cut on the same day should be finished on the same day to prevent cuttings from losing water, bruising incisions and tissue necrosis. It must be noted that thin cuttings will reduce the survival rate, short cuttings will delay the seedling stage.

two。 Make a good cutting bed

The cutting bed chooses the terrain with good leeward drainage to the sun as a bed with a width of 1 meter and a height of 30 centimeters, the bottom layer of the bed bed is covered with 15 cm thick sand loam with certain fertility, and the upper layer is covered with 10 cm yellow sand loam (prepared with 2 portions of yellow sand from 8 broken yellow heart loam) and sterilized.

3. Master the cutting time

Cherry blossom is a deciduous tree species, annual big branch cuttings should be carried out before the tree buds sprout. When the soil temperature reached more than 16 ℃, the cuttings began to take root.

4. Pay attention to the method of cutting

Insert the cuttings vertically with a stick thicker than the cuttings, with a depth of 5-6 cm and a spacing of about 10 cm, then insert the cuttings and press them with your hands. After inserting, spray through the water with a thin-eye spray can to make the cuttings closely combine with the soil.

5. Do a good job of plug-in management

⑴ moisturizes and keeps warm, promoting healing and rooting. In the first and middle of March, the temperature is generally unstable, high and low, if the temperature drop is large, you can take emergency measures to cover a plastic film, such as the daily maximum temperature reaches more than 15 ℃, spray once at noon, and spray 3-4 times a day with the steady increase of temperature in the later stage, so that the topsoil is not whitened. In order to improve the soil condition and make it form healing tissue as soon as possible, extra-root topdressing was carried out with 2% concentration of potassium dihydrogen phosphate 15-20 days after insertion. It took about a month or so to heal and take root.

⑵ builds a shade. After insertion, set up scaffolding and prepare for shading. The height of scaffolding is slightly higher than that of people, so that it is easy to operate. It is conducive to ventilation and create a microclimate in the bed. When the highest temperature of the day is more than 16 ℃, it is necessary to cover the curtain or use a shading net, with a shading rate of 50-70%, and it is best to cover it day and night.

⑶ to remove tillers and sprouts. The sturdy cuttings of cherry blossoms are rich in nutrition and the temperature is too high with plenty of sunshine. Buds and leaves begin to sprout in large numbers when they are not rooted. At this time, except for retaining the terminal bud, the rest will be erased to avoid excessive loss of nutrients.

⑷ can promote root growth by topdressing in time. In order to meet the growth requirements of cuttings, thin fertilizer should be applied in time one week after rooting, and then every 15 days. In this way, after three to four times of fertilization, the roots of the seedlings are developed, the growth is exuberant, and the lower nutrients can be absorbed in advance, and the growth height can reach more than 1 meter in the same year, and the seedlings can be transplanted in the early spring of the next year.

⑸ should pay attention to disease prevention and pest control. Cherry seedlings are vulnerable to diseases and pests, and their leaves are susceptible to leaf spot disease. Carbendazim with 800 times liquid can be sprayed once every semimonthly, and its terminal bud shoots are easy to produce tender shoot borer and aphids. Once newly hatched larvae are found, spraying should be done in time. To avoid damage to the seedlings.