As a result of its rapid growth, evergreen, luxuriant foliage, and beautiful crown shape, it has been used as a garden tree species in many scenic areas such as courtyards, streets, and parks. For example, the suburbs of southern Shaanxi and Jiangsu Wuxi were classified as suitable for planting tree species, and they were popularized by Wuxi as “trees†and were very popular among the people.
First, the collection and storage of seeds
Choose a plant that looks beautiful and grows robustly for the mother tree. When harvesting seeds, they should master their mature characteristics and timely harvest. When the seed coat is black, it indicates that the seed is mature. After harvesting, the seeds were rinsed and the seeds were taken out to dry. The stratification method is then used to sand in a ventilated room or in a field hole with a low groundwater level. The humidity of the sand is generally dispersed by hand in a group.
Second, sowing seedlings in the field
Loose soil with good fertilizer and good permeability was selected as the sowing place. In southern Shaanxi and Gansu, planting seedlings in the spring from mid-March to early April is suitable for freezing damage. It is advisable to use a high bed and the soil is finely pressed. Seed sowing, spacing 25cm. After sowing, the thickness of the cover soil is 2~3cm. After sowing, attention should be paid to the seedbeds, which can be covered with rice straw. After emergence, they can be peeled off. This seedling Qi, the emergence rate of up to 90%.
Third, transplanting and planting
After repeated trials, it was thought that the seedlings of camphor trees would best be transplanted after one year of life. Do not choose to keep bed seedlings, because there are no successful examples of planting bed seedlings, it should be chosen to transplant seedlings for several years. Seedlings transplant density by 0.5m0.3m. After transplantation, the reasonable density of seedlings can be maintained to prepare the seedlings with mulching roots, and the development of lateral roots and fibrous roots can be promoted at the same time, which is favorable to the survival rate of citrons. The more transplants, the more developed the root system and the higher the survival rate. Note that 1-year-old seedlings of camphor trees are prone to frost damage, and the late autumn shoots must be cut off and covered with rice straw. Garden nursery to diameter 2 ~ 4cm is appropriate. The main bark of nursery stock should be green if the trunk is dark brown, indicating that the seedlings are aging and should not be planted. The number of twigs is determined by the number of years of cultivating. It is roughly divided into three levels: 1â„2 of the total number of branches cut from 3 to 6 years of transplanting; 3/5 of transplants from 7 to 10 years of transplanting; 4/5 of transplants from 11 to 14 years of transplanting. The pruning method is to cut off all 1/3 of the lateral branches of the tree. More than 2/3 of the trees are left with a uniform distribution of 3 to 7 lateral branches.
The timing of the planting of citrons is more important. In the spring of southern Shaanxi, from mid-March to mid-April, fall is appropriate in September; Wuxi is the best time from March 25 to April 10, followed by the rainy season, as an opportunity to replant.
Put mulching soil with a diameter of about 30cm when raising the seedlings, and do not disperse the soil. After cutting up, branches and leaves can be cut off, and 1 to 3 pieces can be retained to prevent water transpiration from affecting seedling survival. But be careful not to go to the top, otherwise the crown will form long. In addition, in order to adapt to cross-provincial transportation, a certain number of lateral branches should be removed to increase the survival rate. It has been observed that the survival rate of only large seedlings without leaf picking is only 30% to 50%. When pruning, keep the cut close to the main trunk, leaving no pup joints or torn bark.
The depth, length and width of planting pits must reach 50 to 60 cm. The depth of planting is the same as that of the root and neck of the sweet-smelling seedlings. When planting, the mulching soil should be closely associated with the soil and soil. Therefore, when the big seedlings enter the pit, they must step on the side and fill it until the soil fills until the pits are full and the pits are tightly loosened.
Whether eucalyptus or eucalyptus is planted on a cloudy day or in an eye-catching day, it should be drenched once in a while. When encountering dry and insolated weather, it is necessary to fill once every 7 days with continuous water penetration of 3 to 4 minutes.
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