After removing the covering, it is necessary to set up a shed to shade the sun in time. Shading time and shading degree should depend on the local temperature and climate conditions at that time, so as to ensure that its seedlings are not damaged by sun burns. In autumn, the time and intensity of light should be gradually extended. Until receiving sufficient light to improve the lignification degree of seedlings.

2. Spacing and replanting seedlings

When the seedlings grow to a height of 5 cm to 10 cm, thinning should be carried out, and about 12 plants should be left per square meter. Intercropping requires small spacing between plants, large spacing between plants, eliminating the inferior and preserving the superior, dense spacing between plants and sparse spacing between plants, and the whole seedling should be equidistant, preferably in rainy days. Combined with thinning seedlings, the missing plants are supplemented to ensure the uniform distribution of seedlings.

Step 3 transplant

Luan tree is a deep-rooted tree species; It takes several transplants to form a good and effective root system. Because the trunk of Luan tree is not easy to grow straight, it is necessary to cut off the stubble at the first time and strengthen the management of fertilizer and water. In spring, branches grow from the base, and those straight and strong branches are selected and cultivated into trunk, and then the trunk grows quickly and straight. If the first interception does not meet the requirements, it can be intercepted again in the spring of the following year. The young trees of Luan tree grow slowly, so the first two transplants should be properly densely planted, which is conducive to cultivating straight stems and saving land. After that, it should be properly sparse and cultivated well.

Step 4 apply fertilizer

Fertilization is an important measure to cultivate strong seedlings. At the peak of annual growth; Nitrogen-based quick-acting fertilizer should be applied to promote the vegetative growth of plants. In autumn, nitrogen fertilizer should be stopped and phosphorus and potassium fertilizer should be applied to improve the lignification degree of plants and the cold resistance of seedlings. Farmhouse organic fertilizer should be applied as base fertilizer in winter, which can not only provide continuous nutrients for seedling growth, but also play the role of heat preservation and soil improvement.

5, plastic pruning

Luan tree has a nearly spherical crown and a straight tree shape, and generally adopts a natural tree shape. Due to different uses, its plastic requirements are also different. Courtyard shade trees require a large and dense crown, and the height of primary branches is lower than that of street trees. In the process of cultivation, corresponding pruning measures should be taken around the above requirements. Generally, it can be done in winter or during transplantation.