Collection and preservation of spring ear When the sap has started to flow and the winter buds have just started to grow, select two raw branches, wipe off the overgrown leaves, cut them into scions of 10- 15om, bundle them into bundles, soak the base in human water for about 1 13, and take them with the harvest.
When sowing and propagating, about 2.5 kilograms of seeds are used per mu. For seedbed treatment, select nursery land, apply sufficient base fertilizer and cover it with plastic film. Choose loam with deep soil layer, fertile soil and good irrigation and drainage conditions as nursery land, water it before soil preparation in early spring, apply 2,500 kilograms of high-quality base fertilizer and 50 kilograms of compound fertilizer per mu, rake it flat, spray acetochlor herbicide and cover it with 90 cm wide plastic film for sowing.
When budding, the rootstock should be treated first, and then the buds should be cut, so as not to affect the survival of the buds due to water loss. High-branch grafting usually takes place in spring. Rootstock treatment: try to choose branches with the same thickness as the scion, and cut off other branches at 8- 10 cm above the position before grafting.
Seedlings germinated in autumn are cut off at 18-20cm above the budding contact after the following spring. Prune 3-4 times in summer, and cut off branches from the rootstock. When the budding branch grows to 8- 10 cm, it is tied on the living pile near the base; When it grows to 20-25 cm, tie a knot at the top. Until the grafting is lignified and the living piles are cut off, the seedlings can be cultivated in the field.