Hardwood cuttings of Metasequoia glyptostroboides

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.

I. meticulous land preparation

The nursery land needs flat terrain, deep soil and convenient drainage and irrigation. In general, the land is turned deeply before winter, and after thawing, the land is flattened with phosphate fertilizer of 10 to 15 kilograms per mu, the width of the border is 1.5 to 1.7 meters, the length of the border depends on the number of cuttings, the row spacing is 12 to 15 centimeters, the plant spacing is 3 centimeters, and 17000 plants are planted per mu.

2. Ear harvesting and storage

Metasequoia glyptostroboides cuttings were cut with Lignification branches collected from the side branches of 2-3-year-old mother trees, and the survival rate was higher. The survival rate of hardwood cuttings decreased with the increase of mother tree age.

1. The best harvest time is from the end of December to the first ten days of February every year. It is appropriate to choose the branches of the full year, with a length of 15 to 18 cm.

2. Cuttings storage: about 100 branches as a bundle, the bottom Liping is stored in wet yellow sand, the thickness is about 5 cm. The humidity of the yellow sand is held in the hand, and it is better to spread it out. In order to prevent water loss after sand storage, cover with plastic film to moisturize. The dry and wet condition and the ventilation treatment of plastic film should be checked frequently during the period of sand storage.

Third, the essentials of cutting

The hardwood cutting time of Metasequoia glyptostroboides ends from mid-late March to early April. After finishing the border, cut it on the edge of the water. It is mainly pulp insertion. The 2thumb 3 of the cuttings is inserted into the soil, and the other is exposed to the ground. Put one in and then pour enough water. A week later, due to pulp insertion, soil consolidation or cracking will occur between the rows of the seedling bed, which should be ploughed and loosened 1 or 2 times in time, and then covered with straw between the cutting rows without exposing the border soil, with about 300 kg of grass per mu to moisturize and increase the soil temperature to promote its leaves to take root.

IV. Water and fertilizer management

The false active period of Metasequoia glyptostroboides cuttings is long (nearly two months), and it usually takes 2 to 3 months from cutting to rooting. At this time, strong light, high temperature and large evaporation, therefore, good management of water is the key to the success or failure of all-light seedlings. According to the characteristics of Metasequoia glyptostroboides, the method of "frequently watering" should be adopted. the seedlings must be watered once during the germination period in April and May, once every 10 days during the rooting period in May and June, and once a week during the peak growth period in July and August, and the watering times should be reduced after late August. The height of the seedlings in late July was about 20 cm. For the first time, the seedlings were fertilized with water and ammonium bicarbonate of lO kg per mu plus 1,800 times trichlorfon aqueous solution or carbofuran at the same time to control underground pests. After that, fertilizer was applied every 10 to 15 days, and fertilizer was stopped by the middle of October.