native to Sichuan, it is an evergreen tree with a height of seven or eight meters. The end of the tree is straight like a tower, so it is also called Tabai. With strong adaptability and wide distribution, it is one of the excellent landscaping tree species. Castanopsis kawakamii belongs to Sabina of Cupressaceae, and its seedlings vary greatly. Only a few of them can maintain the excellent characteristics of the mother tree, and seeds are rarely used to sow seedlings in production. Cutting is mainly used to raise seedlings.
habit: like light, but strong tolerance to shade. Cold-resistant, heat-resistant, and lax in soil requirements. It can absorb a certain amount of sulfur and mercury, and has good dust resistance and sound insulation effects.
Propagation method of Chinese juniper
1. Selection of nursery land and bed making: According to the biology of Chinese juniper, we should choose loose, fertile, slightly acidic to slightly alkaline loam with good drainage and ventilation as nursery land, and avoid sticking to alkaline soil and low-lying waterlogged land. Nursery land should be deeply plowed and raked with sufficient decomposed base fertilizer. 2 kg phoxim and 1.5 kg carbofuran crystals can be mixed with fine soil per mu to make toxic soil, which can be scattered on the nursery for ploughing. The width of the bed is 1m, the height is 25cm, and the footpath is 4-5cm.
2. Selection and treatment of cuttings: cuttings can be cut by selecting the mother tree with strong growth and beautiful tree posture. According to the cutting experiments in our province in recent years, the survival rate of cuttings should be cut densely according to the needs of mother tree shaping, and it is best to do it in the morning with dew on cloudy or sunny days, and attention should be paid to heat preservation after cutting. The length of the scion is about 12-2 cm, one third of the branches and leaves at the lower part of the scion are trimmed, and the lower part is cut into a horse ear shape.
In order to improve the survival rate of cuttings, sterilization agent and 5PPm tea acetic acid can be mixed, the lower end of cuttings can be soaked for 5 seconds, then cuttings can be cut, and the effect is also ideal after soaking in 5-1PPm indoleacetic acid for 24 hours.
3. Cutting time and method: Castanopsis kawakamii can be cut all year round. Spring cutting should be early. When the sap after soil thawing flows, cutting cuttings should be combined with the shaping of mother trees. Generally, the cutting period is from late February to early March. Production units widely use autumn cuttings and winter cuttings, and shoot cuttings in summer.
The cuttings treated with tea acetic acid should be directly planted on the seedbed. First, the cuttings should be graded according to their length and thickness, and then cut in sections. The density is generally 5×8 cm. Use sharpened bamboo chopsticks or other branchlets to make holes, and then insert cuttings. You can also ditch and discharge cuttings. Be sure to compact the soil by hand so that the depth of the soil is one-third of the length of the cuttings.
4. Management after inserting: after inserting, use bamboo pole as arch support with arch height of 5 cm, cover with plastic film arch cover, one side is sealed with mud, and the two ends and the other side can be pressed with bricks. From April to September, put up a 1-meter-high shade shed on the transplanting bed of the film arch cover to prevent the film from overheating after sun exposure and burning cuttings. In the early stage, the soil should be kept moist, and the branches and leaves should be moist. The relative temperature in the hood is generally 8-9%. When the temperature is controlled at 3°C, one end of the film should be uncovered for ventilation. When the temperature is higher than 38°C, two ends or sides should be uncovered for ventilation to cool down. In case of extremely high temperature, double reed curtains should be added for shade. According to the situation of water loss, timely use spray method to replenish water in the evening or morning. During the healing and rooting period, the water should not be too much, and the spraying interval can be longer to improve the ventilation of the soil. Promote cuttings to take root. After rooting, the film should be removed in time. The reed curtain is uncovered on cloudy days and covered on sunny days, and it should be opened sooner or later, so that the seedlings can accept the sunshine and rain and grow vigorously.
The rooting rate of cuttings of Sabina vulgaris is faster than that of Sabina vulgaris. As long as it is properly managed, the rooting survival rate in that year can reach over 9%.