How to propagate Magnolia denudata by high pressure and improve survival rate?

In the operation, we should grasp the following technical links.

The time of ① striping is usually from February to May. From the experimental point of view, when the temperature in winter is low and the temperature rises late in early spring, the time of pressing from April to May is more favorable for rooting. On the contrary, you can start pressing in February. Where the tree is strong in spring, the crown with luxuriant branches and leaves can be pressed early, and the crown with weak crown can be postponed for 1-2 months.

② branch selection and branch treatment: annual and biennial branches distributed inside and outside the crown and with a diameter of 1 cm to 2 cm can be used for striping. The experiment shows that when the crown is not too airtight, the rooting rate of inner chamber and lower branch is higher, which should be fully utilized. The Lignification degree of striped branch peeling is directly related to the hairy root. The rooting rate was high when the degree of Lignification was good and the rooting rate was low when the degree of Lignification was poor.

The peeling part of the striped branch can be directly coated with 100 mg / kg ATB1 rooting solution and then bound with soil mass. It can also be bandaged with culture soil mixed with 20-50 mg / kg ATB1 rooting solution. With the above methods, the rooting rate of pressed branches is high, and the number of roots is generally increased.

③ artificial planting can improve the survival rate: branches can be cut off from the crown 3 to 5 months after high pressure. The young roots of the striped seedlings cut are weak, and the survival rate is lower if they are planted directly. False planting is an important technical link to improve the seedling rate of striping.

The specific practice of pseudo-planting: first of all, the cut branches will be pruned according to the situation of root. Pressing branches with many roots, leaving 50-60 cm, cutting off tip and removing branches and too many leaves. Generally, 5-6 leaves are left in each strip. The laminated branches with few roots remain 20-30 cm, generally leaving no branches or 2-3 and a half leaves. Secondly, choose a cool, fertile and loose garden. The whole bed is 30 cm high and 15 cm to 20 cm deep ditch to be planted. Third, remove the plastic film wrapped outside the soil mass and try not to scatter the soil mass as far as possible. Fourth, the base of the pressed branch was soaked in the aqueous solution containing 50 mg / kg ATB1 rooting powder for 1 hour, and then planted on the furrow at a distance of 20 cm to 25 cm. Pressing seedlings into the soil 15-20 cm, the root soil should be adhered to. If the temperature is high, a 50-60 cm shade should be built on the border. Strengthen the management of fertilizer and water, adjust the light on the border, and press the strong seedlings out of the nursery after 3-5 months.