How to select metasequoia seeds? What are the methods of raising seedlings?

Metasequoia glyptostroboides has strong adaptability, like moisture and suitable environment to grow fast. at present, it is cultivated in most parts of our country. The material of Metasequoia glyptostroboides is light and soft, so it can be used for construction, sheet metal, papermaking and other applications. Metasequoia glyptostroboides has a certain resistance to sulfur dioxide and is an ideal tree species for landscaping in industrial areas and mining areas. So how to select metasequoia seeds? What are the methods of raising seedlings? Next, let's have a look with the editor.

How to select Metasequoia glyptostroboides seeds?

Metasequoia glyptostroboides seed source is few, and relatively small, a small number of seeds had better be raised by nutrition cup. Metasequoia glyptostroboides usually has to reach the age of 25 to 30 years before it can bear fruit. The Metasequoia glyptostroboides cone matures from mid to late October to November. When the cone scales become yellowish brown and a small number of seeds fall out, the cones are harvested in time and dried in sunny weather for a few days. When the fruit scales are mostly split, the seeds can be obtained. The seed emergence rate of Metasequoia glyptostroboides is about 7%, and the seeds are dried in cloth bags. Metasequoia glyptostroboides seeds have more shrunken seeds, the germination rate is low, and the general germination rate is 9%.

What are the seedling raising methods of Metasequoia glyptostroboides

1. Sowing and raising seedlings

The land with sufficient water source, good drainage, few diseases and insect pests and rich and loose soil should be selected for sowing and raising seedlings. The preparation of the bed should be meticulous and fully fertilized. The sowing time is generally from March to April, and it is suitable when the ground temperature reaches 12 ℃. Strip sowing (row spacing 20~25cm) or sowing, sowing amount 1~1.5kg per mu. Before sowing, fill enough bottom water and sow the seeds with fine sand. It is appropriate to cover the soil with no seeds. After sowing, the grass was covered and sprinkled properly, and it began to germinate in about 10 days. after the seedlings basically came out, the grass cover should be removed and shaded in time. During the period of seedling growth, grass should be pulled, soil loosened, watering and topdressing should be applied several times. The shady shed can be gradually removed after September. 1-year-old seedlings can be as high as more than 40cm. In the coming spring, you can go out of the nursery to plant or move the bed to cultivate big seedlings.

2. Cuttage seedling

The rooting ability of Metasequoia glyptostroboides cuttings decreases with the increase of tree age, and cuttings are generally taken from 1-3-year-old seedlings.

(1) Spring planting

Generally, the cuttings are long 10~15cm, the upper end is cut flat at the off-bud 1cm, and the lower end is cut obliquely. The cutting part of the cuttings on the branches is better in the tip and middle section of the young trees, and they are cut along with picking. In order to improve the survival rate of Metasequoia glyptostroboides cuttings, the cuttings "winter storage" method is generally adopted in addition to the treatment with growth hormone. In winter, cut the robust branches from the mother tree and cut them into cuttings, and tie them into a bundle of cuttings every 60 to 100 times in thickness. Select the place with leeward, sunny direction and good drainage, dip the base of the cuttings in bundles and bury them upright in the wet sand, and cover the mat above to prevent the soil from freezing rain and snow into rotten strips. The practice shows that the cuttings of Metasequoia glyptostroboides after winter storage can soften the basal tissue and take root easily after insertion, which is beneficial to improve the survival rate and seedling rate. After Metasequoia glyptostroboides cuttings, the temperature rises slightly, as long as properly watered to keep the seedbed moist, there is no need to shade immediately, which can improve the soil temperature and help cuttings to take root. After late April, shading begins, covering early in sunny days and uncovering late in sunny days, but not in rainy days. After the summer day, gradually shorten the shading time, after early September, can no longer shade. We should often loosen the soil and weed. After rooting, the cuttings were fertilized for 2 or 3 times to promote the growth of seedlings.

(2) Summer planting

From late May to early June, when the highest temperature reaches 27 ℃ ~ 28 ℃, when the ear is not dry in the early morning, select the semi-lignified twigs with long 14~18cm, retain the top tip and upper 4-5 feather leaves, insert 4~6cm into the soil, cutting 70, 000 ~ 80, 000 plants per mu. The twig has exuberant physiological activity and strong regeneration ability, and it can take root after 20-25 days. After shading, spray 3-5 times a day to keep the seedbed moist. The shading time is gradually shortened from late August, and the shade shed can be removed after late September to promote the Lignification of seedlings to survive the winter.

(3) Autumn cutting

It can be carried out from the end of August to the first and middle of October, before the first defoliation. Cuttings should choose branches with short internodes and strong growth, and avoid cutting cuttings with long branches with long internodes. Cuttings length 12~20cm, preferably with apical tip or terminal bud. When picking and cutting cuttings, the cuttings should be put into a bucket or basin in time to keep the cuttings moist. On the whole bed, it can be cut in the water, or it can be drilled with a thin stick, and the row spacing is 3cm × 10cm. If the bed is not moved, the row spacing can be 5cm × 15~20cm. After cutting, water thoroughly for the first time. Early autumn cutting, the temperature is still high, to appropriate shade, pay attention to regular watering, to keep the seedbed soil moist. Late cutting, should be properly watered, do not need shade. The cuttings healed and took root in about 1 month. After the arrival of the first frost, covered with plastic film, heat preservation and light transmission, which is beneficial to the root development of cuttings, it will be planted in bed according to a certain row spacing in March next year, and large seedlings will be cultivated. Metasequoia glyptostroboides planted in autumn for a long time, a wide range of sources, and the effect is good.

The above is the introduction of Metasequoia glyptostroboides. Because the cuttage propagation is relatively easy, and the seedlings obtained grow healthily and neatly, people often use cuttage propagation, and cuttage breeding is an effective way to accelerate the propagation of metasequoia glyptostroboides.