Toona sinensis Seedlings and Transplanting Techniques

Citron is a type of eucalyptus in the genus Polygonaceae. It is an evergreen tree with a height of 30 meters and a diameter at breast height of 5 meters. Irregular longitudinal bark cracks; branches, leaves, and wood all have a camphor-like taste. Leaves alternate, thinly leathery, ovate or ovate-elliptic, 5-10 cm long, 2.5-5.5 cm wide, apex acute or subapical, base broadly cuneate to suborbicular, entire, slightly undulate, bilateral Hairless, with three outgoing veins from the base, pinnate veins coexist, veins with marked glandular fossa; petiole length 2-3 cm. Flowers bisexual, panicles axillary. The berry is nearly spherical with a diameter of 4.5-6 mm. It is green at the beginning and turns red. It has a shiny purple color at maturity; the fruit tray is truncated at the top. Flowering from April to May. Fruit matures in October-November, strong in size, and once in every one or two years. Eucalyptus is a warm and humid climate, where the average annual temperature is above 16°C, and the absolute minimum temperature is not lower than -7°C. The requirements for soil of eucalyptus are suitable for soil with deep fertile and wet neutral or acidic hair. Young age is shade-resistant, strong and strong in the prime of life, and has a long life. There are often old trees near the village.

The breeding and breeding of eucalyptus: The propagation method is seed propagation, and hardwood cuttings can also be used, but its survival rate is low, and it can also be propagated by root cutting or tillering. The following describes the cultivation techniques of Citron:

1. Seed-collecting: Seed-collecting species should choose the well-developed perennial Torreya grandis mother tree, which matures from October to November. The lunar calendar is frost, the skin turns from green to red and purple, and the ripening is self-falling. It should be harvested in a timely manner. Can not be used for too long, and susceptible to damage by birds, but the early collection, germination rate is low, difficult to handle and difficult to store. After fruit collection, treatment should be carried out immediately to avoid accumulation of heat and damage to the embryos. After 2-3 days, the pulp should be wiped off. After washing, the ash should be defatted for 12-14 hours, then washed and dried, and the seeding rate should be 25-30%. Seeds of 1000-grain weight 120-130 grams, 7,600-8,000 per kilogram, germination rate of 80-90%. After the seeds are dry, they will be sowed in autumn or mixed with wet sand until the spring of the next year, mainly in spring sowing.

2. Nursery: The nursery should be shaded and sheltered from the wind. Eucalyptus seed germination is extremely slow, so seeds should be prepared before sowing, dry seeds should germinate, can be soaked in warm water, mixed sand storage seeds are best soaked with 0.5% potassium permanganate for two hours, so that germination is more Well, sowing time is generally in the middle and early February. If the temperature in spring is low, late frost can be postponed until mid-March, and the frost-free area can be harvested. Drilling can be used for sowing, generally about three centimeters deep ditch, 40-50 seeds per meter long sowing, per acre seeding rate of 10-15?, Cover with humus or fire soil, about 1.5? Thick, and covered grass. Seeds after germination soil two to three centimeters is appropriate, about 20-25 centimeters away, the germination takes a long time, generally 40-50 days after sowing began to germinate, lasting more than 50-60 days, seedlings unearthed. The germination is very irregular, and the seeds in the wetlands germinate about 20-30 days and are not very neat, and can be soaked in warm water to sow germination before sowing. No shading is required after unearthing. Seedlings are seedlings with several true leaves. Seedlings are seedlings with a height of about 10 to 10 seedlings per meter. July-September is a period of vigorous growth of seedlings, pay attention to top dressing and drought resistance. Annual seedlings are about 30-50 (80) tall and can be planted by afforestation. When the seedlings are overwinter, wind barriers must be provided (in the west, north, and east, the seedlings can be raised with wooden piles above the seedlings) or in the seedling rows to fill the rags to prevent cold. The main roots of the seedlings are thick and long and the lateral roots are sparse. When the seedlings are lifted, the roots are prevented from tearing. When planting, they can be cut off or the branches and leaves can be properly cut to increase the survival rate. In order to promote the formation of lateral roots, when the seedlings form 3-5 true leaves, cut 5-6 cm deep with a sharp blade, and fully water after cutting. Seedlings can also be used for afforestation, that is, after spring sowing, the plum rain season, about 7-12 cm high, with 5-6 true leaves, root length 8-15 cm, and the formation of lateral root seedlings direct afforestation, before rain or rain Planting and afforestation are sometimes better than annual ones. In order to accelerate the growth of seedlings, the base fertilizer should be applied before sowing, and the fertilizer and the seedlings should be timely after the seedlings are unearthed. Usually, one seeding ditch should be opened per meter, and ten seedlings are suitable. Next year, according to the requirements of planting trees, the transplanting of row spacing should be determined.

3, transplant afforestation: I use more bare root seedlings to plant seedlings, seedlings are treated with leaf cutting, not cutting leaves, cut dry three, in order to ensure survival, usually should choose to go to the leaves, in order to reduce the amount of transpiration, planting time in no special Severely frosty areas. From the beginning of January, germination of new shoots can be transplanted, and the survival rate of large seedlings with soil is high. This method is suitable for sporadic planting.

4. Torreya grandis is an important tree species in urban greening. It has the good name of “Xiangshan Avenue” and “Xianghe Garden”, which can beautify and purify people’s work, study and living environment. Let's talk about the transplanting of the trees of the camphor tree:

Transplanting of large trees of Toona sinensis is usually applied to large trees with a DBH of 10 cm or more. The best transplanting period is from early spring and autumn to the late autumn before the soil is frozen. The above-ground part of the tree is in a dormant state, which is conducive to improving the survival rate. 1 Transplanting with a crown: The transplanting method with a crown is basically to maintain the original transplanting, often for the specific requirements of landscape cargo must be crowned transplanting, the technical difficulty is higher, the crown can be recut, and half of the leaves are retained , reduce evaporation loss of moisture and nutrients. 2 Root-reduction crown reduction method: It is a common method for transplanting large-scale trees of T. sinensis that are planned to be transplanted for cutting roots and reducing crowns. When pruning, the basic skeleton of the tree is maintained, and the root-separation range is 8 times of trunk diameter at breast height. Cut off and form a large earth ball. 3 cut-dry method: commonly used in large diameter, inconvenience, distance away from the big tree, cut off the height of 3-3.5 meters. Some precautions: Apply a preservative to the wound on the branch or use a plastic film to make a cut. Apply rooting powder to the root and dry it with a straw rope. Water the roots before the excavation day. The diameter of the soil ball is 6- 8 times, digging edge with straw rope tight, earth ball thickness of 3-6 times the diameter of the breast. Be careful not to hurt the bark when lifting, the earth ball near the driver's cab, the canopy toward the rear of the car, the trunk wrapped with soft material and a soft rope on the canopy fixed on the car; when planting, three columns are used to support the trunk to prevent the wind from being skewed, and the canopy can be planted. Spray water, fertilize as appropriate, pruning weak branches, cultivating new shoots, eradicating adventitious buds, etc., take a shading shed in midsummer, wrap cold weather in winter, and implement the principle of “three-point cultivation and seven-point cultivation”.

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