① Collection and storage of branches
Branches should be collected from healthy trees without diseases. It is suitable to use annual branches outside the crown with a thickness of more than 0.5 cm (the survival rate of branches over 2 years is 30%-50% lower than that of annual branches). If the branches of plum blossoms are used as cuttings, it is easier to take root. You can cut them into branches with flat upper mouth and horse-ear lower mouth, which are about 15 cm long, and cut them directly. If China cherry, which is difficult to take root, is used as cuttings, annual branches with short two-year branches should be used as cuttings. This cutting has the advantages of fast wound healing, early rooting and high survival rate. If the cuttings are not used in the autumn of that year, they should be bundled every 50- 100 branches and buried in winter for use in the spring of the following year.
② There are two cutting methods: cutting and root cutting.
According to the season, there are three kinds of cuttings: spring cuttings, summer cuttings and autumn cuttings. The survival rate of cutting in autumn is high. Spring sowing should be carried out as soon as possible after soil thawing.
When cutting, ditch irrigation first, and then cut, the depth shall not be less than 10 cm. The angle between the vertical line at the top and the bottom of the cuttings is kept at about 30 degrees. The soil thickness should be flush with the upper mouth of the scion or greater than 1-2 cm to prevent the cuttings from being pulled out. Pay attention to covering grass for cold protection in autumn cutting and covering moisture in summer cutting.
Loose soil is cut by flat bed, and clay is cut by high ridge.
China cherry, which is easy to tiller, is propagated by cutting roots, and the selected roots are more than 0.7 cm thick and 10 cm long. Spring and autumn cuttings can be used in the same way as branch cuttings.
③ Management of cutting seedlings
After the branches germinate, the callus grows from the base incision. Before rooting, it is necessary to pour a small amount of water to soak the lower wet soil (which is the key water). Just because the leaves are sprouting and spreading doesn't mean that they have taken root and sprouted and become seedlings. This is because branches store nutrients and sprout to spread leaves. When the new shoots grow to 20 cm, apply quick-acting fertilizer once in coordination with irrigation, and apply 7 kg urea per mu (or human manure 1000 kg) to promote the growth of seedlings. Wipe the buds in time after the seedlings survive.