After flowering in spring, or September to 65438+1October in autumn, girdle or scrape the 23-year-old branches from the base to the depth of 1/3 branches, and then bury the whole branches in the soil, only the branches are exposed outside the soil. Always keep the soil moist, and a small number of new roots can germinate in the autumn of that year. In the spring of the following year, the scale buds at the top of the layering germinated and grew into new branches, and the latent buds and intermediate axillary buds also began to swell, and new roots were produced at the base of the branches that year. 10 ~ 1 1 month, basically formed a complete root system, 30 ~ 50 cm long. In the spring of the third year, latent buds and axillary buds were unearthed one after another, developed into new branches, and the root system continued to expand. During September ~ 10, the new plant was separated from the mother plant, dug up and transplanted.
2. The whole plant oblique layering method
In this method, the ramets are planted obliquely, and all the branches are pressed down as layering. Stand the ramet in the hole, make the root neck slightly lower than the ground, let the roots spread out and distribute evenly in the hole, and then one person will support the seedlings and one person will fill the soil. When the soil is filled to 2/3 of the depth of the hole, a ditch is naturally formed along the line, which is just used for layering. At this time, the fill in the hole will be compacted, and then the branches will be flattened along the ditch from near the root neck, slightly inclined upward, and the top of the branches will be left outside the soil. Compacting the soil until it is flush with the ground, and then ridging it to keep moisture and temperature and promote its rooting.
The law of germination and rooting of the whole plant with diagonal layering is the same as that of the original plant with in-situ layering, but the growth potential in the first year of planting is weaker than that of the original plant with in-situ layering, and it can grow vigorously in the second year. Branches germinated by layering can be leveled in autumn, which can not only obtain a large number of high-quality scions, but also promote the germination of more tillers. In the Central Plains, after two years of growth, the pressed branches can be cut off and planted separately, and after three years of growth, the standard of selling finished seedlings can be reached.
It is a good method to accelerate the reproduction of rare varieties by planting seedlings obliquely and leveling them layer by layer year by year. The wound is small, and it is easy to survive and grow vigorously after planting.
This method can also be applied to the production of peony cut flowers. Because of its layering, the sprouted new branches can be evenly distributed in the row, and the branches grow evenly. Branches born that year can form flower buds that year and can be cut off the next year.
3. High hanging bag layering method (air layering method)
Some peonies with tall and lonely plant types can only be propagated by air layering instead of underground layering. The seedlings cultivated by this method have developed fibrous roots and short plants, which are suitable for potted plants. This method is suitable for tender branches, and should start at 10 day after the flowers wither, and should not be too early or too late (that is, the branches are too tender or too old). The methods are as follows: ① girdling is carried out at the axils of the second or third leaves at the base of annual new shoots, with a width of 0.5 ~ 1.0 cm and a width of about 1.5 cm.
② Indoleacetic acid (50 ~ 70 mg/L), ABT 1 rooting powder (40 ~ 60 mg/L) and Gengenling (diluted with water 15 times) were used for treatment. Soak 0.5 kg of absorbent cotton in the above solution, take out the excess solution, pull it into a sliver with a width of 1.5 cm, and wrap it around the top of the girdling part.
(3) Bag hanging: hanging the bag with a film with the width of 14cm and the length of 18cm at the ring cutting place, filling the substrate (1 part of crushed moss and1part of slag less than 0.5mm are mixed in equal weight ratio), running and compacting, and fixing the bag with a bamboo pole. Inject a proper amount of water into the substrate in the bag with a syringe to keep it moist.
After treatment, the branches take root for about 45 ~ 60 days. In the past, only water was injected into the bag in time. When the callus develops, the nutrient solution made of ammonium nitrate, potassium dihydrogen phosphate and zinc sulfate is supplemented, and the pH value of the solution is adjusted to 6.0 ~ 6.5. When sprouted young roots can be seen outside the bag, cut them off in time, move them into flowerpots or seedbeds (high-quality humus soil is selected as the culture soil) and plant them deeply. Culture in semi-shade for half a month, and then culture in full light. Spray nutrient solution (sugar 60g+ urea 60g+ potassium dihydrogen phosphate 40g+ water 10kg) every 5-7 days, * * 3-4 times. Pay attention to keep the soil moist.