Hardwood cuttings of Metasequoia glyptostroboides?
The hardwood cuttage techniques of Metasequoia glyptostroboides are as follows: 1-3-year-old mother trees are selected to take cuttings or collect seed strips from round ears in spring, and 1-year-old seedlings and their lateral branches can also be used as cuttings. The survival rate of cutting cuttings in the tip and middle section of seed strips is higher, generally cutting cuttings 10 to 12 centimeters long, slightly cut into 15 to 18 centimeters long. Before cutting, the cuttings can be soaked in 50mg NAA per kg for 20 to 24 hours, or 500mg NAA per kg for 3 to 5 seconds, or 100mg ABT rooting powder per kg for 10 to 20 hours before cutting. Hardwood cuttings, row spacing 8 to 12 cm by 18 cm or 7 to 10 cm by 20 cm. About 46 to 70 plants per square meter. The cutting depth is 7 to 8 cm. When the temperature reaches about 10 degrees Celsius, the winter buds in the upper part of the cuttings begin to sprout, and then new shoots or feathered leaves are drawn out one after another. Until late May, the cuttings had not taken root and were in a state of "false activity". Cuttings generally take root only when the temperature is stable above 20 degrees Celsius from the first and middle of June to the last ten days of June. During the period of "false living" and rooting, we should pay attention to water management, watering frequently, less quantity, keep the soil moist, but not too wet and cause the lower end of cuttings to rot.
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Prevention and Control of main Diseases and insect pests of Metasequoia glyptostroboides
Sudden fall disease (blight): the fallen leaves should be removed and treated in time after falling leaves in autumn, and then 3~5Be stone sulfur mixture should be sprayed to the ground. Metasequoia red blight: immediately after the end of the plum rain season, 1% Bordeaux liquid is sprayed on the crown for 5 times, once every 10 colors for 15 days, the disease can be controlled. Color roll moth: the best control period is the early stage of larval sting (early and middle April). 50% fenitrothion, 40% dimethoate, 80% dichlorvos and pyrethroids can be used in dry season (July and August).
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Full light seedling raising method of Metasequoia glyptostroboides hardwood cutting
Shading method is often used to raise seedlings of Metasequoia glyptostroboides. This requires the use of a sunshade net and the cover of the shade every day. The experimental study on full-light seedling cultivation of Metasequoia glyptostroboides hardwood cuttings shows that the general survival rate can reach more than 90% by using appropriate methods. The method is introduced as follows: the land for fine soil preparation and seedling cultivation needs flat topography, deep soil and convenient drainage and irrigation. In general, the land is turned deep before winter, and after thawing, the land is flattened with phosphate fertilizer of 10 to 15 kg per mu and the width of the border is 1.5 to 1.7 meters. the length of the border depends on the number of cuttings, and the row spacing is 12 to 15.
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