Planting techniques of Toona sinensis

Toona sinensis, also known as Toona sinensis bark, Toona sinensis, etc., is a tree plant of the genus Toona of the bitter family, with a straight and tall trunk, a round hemispherical crown, a rather spectacular leaf, shady leaves and red fruit in autumn, although the leaves and flowers are slightly smelly but not serious, so it is still a good ornamental tree and shade tree. Let's take a look at the planting techniques of Toona sinensis.

Ecological habits of Toona sinensis

Toona sinensis is light-loving, shady and adaptable. In addition to clay, all kinds of soil and neutral, acidic and alkaline soil can grow, which is suitable for deep, fertile and moist sandy soil. Cold-resistant, drought-resistant, not resistant to water and humidity, long-term stagnant water will rot and die. Deep-rooted, strong resistance to smoke and sulfur dioxide, less diseases and insect pests. It is widely cultivated all over the world except Heilongjiang, Jilin, Qinghai, Ningxia, Gansu and Hainan.

Propagation techniques of Toona sinensis

Toona sinensis trees are generally propagated by sowing, cut off the twigs together when the wing country is mature, dry them in the sun, remove the impurity and then hide them, and the germination power can be maintained for 2 years. Soaking seeds in 40 ℃ warm water for one day and night before sowing could germinate 5-6 days earlier. The sowing rate is 5kg / mu, the row spacing is 25cm / mu, the soil cover is 1cm / mu, and the germination rate can reach 85%. The suitable temperature for seed germination is 9: 15 ℃, and the seeds are usually sown from early March to late April. The annual seedling is as high as 60cm and 100cm, and the diameter of the ground is 0.5cm and 1.5cm. In addition, split and root cuttings can also be used for propagation. As a large seedling for street trees, the trunk is required to be straight and the branching point is high. Generally, flat stubble can be carried out in the second spring of raising seedlings, and then the lateral buds should be removed in time to make the trunk extend continuously, and then let the lateral branches form a crown after reaching a fixed height. Transplanting in spring should be carried out when the strong buds in the upper part of the seedlings expand into a ball, and should be planted properly.

Planting techniques of Toona sinensis

1. Seedling planting and afforestation: it can be planted in both spring and autumn, and the key is to master the suitable time and deep planting. Afforestation should be planted early in spring, when the volume of strong buds in the upper part of the stem increases in a spherical shape, and the depth should be more than 2-3 cm above the root neck. Leveling ditches or fish-scale pits can be used for ground preparation on the mountain, and cave-like ground preparation is often used in no concave-convex area. The density of afforestation should not be too large, and the row spacing of common plants is 1 × 2 meters. The root hole is 40 cm long, wide and deep. Dry cut-off afforestation should be used in dry and windy places. In early spring, the depth of buried soil is 15-18 cm above the root neck, and the upper end is flat with the soil surface or 1 cm of excavated surface.

2. Direct seeding afforestation: the survival rate of direct seeding afforestation on shady slope and semi-shady slope is high, and the afforestation time is carried out in spring, rain and autumn. It is common to plant seedlings in the rainy season in spring, and the ovules are easy to survive without budding. Spring sowing rainy season dew seedlings, although some of the ground withered during the winter, but the next spring can still sprout from the rhizosphere. The reverse slope fish scale pit is trenched in parallel with the outer edge, and planted on the outer platform in the way of inner ditch and outer platform, with a width of 5 cm 6 cm, a depth of 3 cm, 40 seeds per ditch and soil cover of 1.5 cm 2.0 cm, with a seed amount of 0.5 kg per mu.

3. Tending and management: for 1-2 years after afforestation, the tree can be stubbled once every autumn or spring, and the height of the tree can reach 2-3 meters in that year. A strong sprout strip is selected from April to May, and the buds are picked and nurtured for many years. Stop picking buds when the tree height growth reaches the required height, so that the growth height is gradually weakened and the growth of breast diameter is increased. In the third year of direct seeding afforestation, there are some phenomena such as winning glory and striving for fertilizer. In order to ensure the rapid growth of superior plants, it is necessary to get rid of weak seedlings as soon as possible. If the common site condition is good, the seedlings grow fast, the time of interseedling is earlier and the intensity is higher, on the contrary, the time of interseedling is late and the intensity is small.

4. Disease and pest control

① Toona sinensis Pi'e: looking for cocoons and pupa on treetops and trees in winter and spring. Check the insect dung under the tree and the victim on the tree, and it is found that the larvae artificially vibrate the branches and hunt them. Spray and scatter control can be used in larval stage, such as 20% 2000 times of methanesuril EC, 2.5% 2000 times of kungfu EC, 2.5% 2000 times of enemy killing EC, and so on. Lights trap and kill adults.

② wax cicada: scrape off the egg mass from the tree in the cold winter. Mixed forests are built in pure forests that cause serious damage. Try to take care of mortal enemies such as parasitoids that make use of locusts. Adults and locusts can be sprayed with 20% phoxim EC 1500-2000 times or 50% monocrotophos water solvents 2000-3000 times or 50% phoxim emulsion 2000 times or 40% dimethoate EC 1500-2000 times.