1, seedling fixing
Generally, after sowing, seedlings begin to emerge in 7 ~ 10 days, and 10 ~ 15 days. When the seedlings grow 2~3 true leaves, the mulch should be removed. When the seedling height 15cm, the seedling spacing 10~ 15cm, and the number of seedlings per mu is about 8000.
Step 5 transplant
For green seedlings, it usually takes 3-4 years to leave the nursery. Because the top branches of seedlings have dense buds and short spacing, the trunk is easy to bend. In the spring of the following year, transplant annual seedlings according to the plant spacing of 40-50 cm and the row spacing of 70-80 cm, and cut off the trunk 3-5 cm from the ground after planting.
Because Sophora japonica has the ability to germinate, it is easy to germinate in large quantities after cutting. When the sprouted branches grow to the left and right of 20cm, 1 upright and robust branches are selected as the trunk, and all other branches are erased. Pay attention to tillering and lateral movement at any time in the future, and temporarily keep the weak lateral branches in the upper, middle and lower parts of the trunk, which is beneficial to prevent the trunk from bending. In this way, the seedling height in the second year can reach more than 3 meters.
3. Fertilizer and water management
The watering times of Sophora japonica seedlings should be determined according to climatic conditions, soil texture and other factors. Under normal circumstances, water should be poured 2-3 times from emergence to rainy season, and frozen water should be poured 1 time before the nursery freezes to prevent timely drainage in case of waterlogging;
Before sowing, about 3000 kg of base fertilizer (mainly organic fertilizer or ring fertilizer) should be applied to the seedling field. By the first ten days of June, the quick-acting nitrogen fertilizer F (such as urea) can be applied to the paddy field in combination with watering for 8~ 10kg, and urea can be applied in July ~ August (it is best to mix an appropriate amount of compound fertilizer 12~3 times, and the amount of fertilizer applied each time is about 30kg). Stop watering and fertilization after September to promote lignification of seedlings.
4, plastic pruning
According to the need, it can be shaped and trimmed into three tree types: natural happy, cup-shaped and natural closed-axis trunk. Natural happiness refers to fixing the trunk when it is more than 3m long, selecting 3-4 branches with healthy growth and appropriate angles as the main branches, and removing the side branches and buds below the main branches in time. When cutting in winter, the main branches should be cut short and medium, leaving 50-60 cm to promote the growth of secondary branches and form small crowns;
Cup-shaped, that is, keep three main branches like a natural heart, and cut two side branches from each main branch in winter to form six branchlets. In summer, the growth is controlled by coring, and two branches are cut off from each twig in the following winter to form a cup-shaped "three branches and six weights 12 branches".
The trunk shape of natural combination means that after the main branches are retained, as long as the strong terminal buds and upright buds are retained in the future, pruning will be carried out to cultivate strong branches at all levels, so that the crown will continue to expand.
Extended data:
Distribution of Sophora japonica origin:
1, Sophora japonica originated in China, and is now widely cultivated in northern and southern provinces of China, especially in North China and Loess Plateau. It is also distributed in Japan and Vietnam, found in Korea, and introduced in Europe and America.
2. Sophora japonica likes light but is slightly tolerant to shade, which can adapt to the cold climate, with deep and developed roots and not strict requirements for soil. It can grow normally in acidic to calcareous and slightly saline-alkali soil, even if the salt content is about 0. 15%.
It is wind-resistant, drought-resistant and barren-resistant, especially suitable for urban soil hardening and other harsh environmental conditions, but it grows poorly in low-lying stagnant water and has strong resistance to pollution such as sulfur dioxide and smoke. It grows faster when it is young, grows at a moderate speed in the later period and has a long life. Old trees are easy to be hollow, but the latent buds have a long life, which is beneficial to crown regeneration.
It takes time for Sophora japonica to bloom;
1. According to the introduction of Sophora japonica planting experts, the flowering period of Sophora japonica is July-August. Sophora japonica is often planted beside houses and roadsides, and is widely cultivated all over China, mainly in the north, mainly in the Loess Plateau and North China Plain. Generally, it blooms from April to May every year, and the flowering period is about 10 ~ 15 days.
2. Sophora japonica, also known as Sophora japonica, is the flower of Sophora japonica, a leguminous plant. It is a perennial flower with pale yellow racemes and butterfly-shaped corollas. When flowering, it is clustered, overlapped and drooping, and can be used for cooking, Chinese medicine or dye, medicine, cooling and astringent, hemostasis and blood pressure reduction. It is also an important nectar source plant.
3. Before sowing, about 3000 kilograms of base fertilizer (mainly organic fertilizer or ring fertilizer) should be applied to each mu of nursery land. By early June, 8~ 10kg of available nitrogen fertilizer (such as urea) can be applied topdressing per mu in combination with watering, and urea can be applied topdressing in July ~ August (it is best to mix an appropriate amount of compound fertilizer 12~3 times, and the amount of fertilizer applied each time is about 30kg). Stop watering and fertilization after September to promote lignification of seedlings.