The aphid seedling asexual propagation technique utilizes the saccharine branches, roots and other nutritional organs to propagate seedlings. It is characterized by the rapid growth of seedlings and their ability to maintain the superior species of the mother tree.
There are two main types of clonal propagation of Toona sinensis:
One, root seedlings
Root seedlings, also known as seedlings. The specific approach is to dig deep 60 cm in depth and 30-40 cm in width around the female tree and in the projection of the edge of the crown before deciduous plants in autumn, or before thawing plants in the spring. Ditch the farmyard fertilizer and water it. After the water infiltration, the trench is filled with soil. A lot of root seedlings can sprout around the mother tree between April and May of the following year, and the number of seedlings increased by 2-4 times than that of natural seedlings. You can also use the root method to promote the root seedlings by digging the top soil under the canopy, exposing the roots but continuing to grow roots. When the seedling height 25 to 30 cm, 15 cm to the root soil, promote lateral roots, bred after transplanting large seedlings. The method of root seedling raising is simple, the cost is low, and it is possible to maintain the good traits of the parents, but the amount of seedlings is less. The root seedlings have different growth stages due to their different germination stages, and their mother roots are different in thickness and position. In addition, the root seedlings are often clustered and the size of the seedlings is different. In the autumn, only 20% of the seedlings that can grow to more than 1 meter are qualified. For production. The seedlings must be excavated and transplanted into a nursery for another year before they can be used for production. Therefore, it is necessary to remove excessively small seedlings during production and transplant them into nurseries to ensure that the seedlings have sufficient growth space.
Second, rooting seedlings
Root seedlings are also known as buried seedlings. It is the use of the characteristics of the strong germination of the root of Toona sinensis, and it is used as a breeding method for breeding seedlings as a propagation material. After the seedlings are taken out of the nursery in autumn and winter, the roots left in the nursery are picked out, or lateral roots are dug from a more than three-year-old robust mother tree. Pick a root strip of 0.5 to 1.0 cm and cut a small section about 15 cm long. The upper end (big head) is cut into flat surfaces, and the lower end (small head) is cut into bevels, and the cut surfaces are to be smooth. 30 to 50 bundles are bundled and the lower ends are aligned. Dig a pit 60 cm deep, 100 cm wide, and the length depending on the amount of root. Put 10 cm of leaves or wheat straw on the bottom, and then lay 20 cm of clean wet sand. The lower end of the root is weighed in a 0.05% Naphthalene acetic acid solution, or soaked in 0.005% to 0.01% acetic acid for 10-20 hours. The upper end is then washed up and the lower end is vertically laid down on the sand layer. The root strip covers the sand and the pit mouth is flat, then covers the film to increase the temperature and moisturize the germination. It should be noted that the moisture content of the sand should be appropriate, so that the hand can be held in groups without water, and loose hands can be naturally dispersed. When the weather is cold, grass cover is covered at night. The temperature of the sand reservoir generally does not exceed 18°C. When new shoots grow on roots, they can be planted by cutting roots.
Buried root nursery can be used flat seedlings or high ridge seedlings. The flat rice seedlings are 1 to 1.2 meters wide and 10 to 20 meters long. According to the spacing of 30 to 40 cm to open the ditch, the bottom of the root section of some grass ash, according to the spacing of 20 to 30 cm was inserted into the soil at an angle of 30 degrees, the top end with the ridge facing the flat, covering 2 to 3 cm. Raise the seedlings on a high ridge and make a ridge with a height of 20 to 30 cm and a bottom width of 40 cm. Pyramid distance 40 to 50 cm, east-west direction. In the middle and lower part of the sunny side of the high ridge, the upper end of the root seedling is inserted into the earth obliquely to the north with a spacing of 25-30 cm. No matter which method is adopted, attention should be paid to separating the thickness of the root section when cutting the cuttings, cutting the cuttings in sections, heading upwards, and smashing down the heads, which cannot be reversed. The thickness of the cover soil is no longer subject to the root, and the mulching film will increase the temperature and moisten the cuttings and promote the emergence of seedlings. When emerged, attention should be paid to observation, and the topsoil should be smashed in time to prevent boring buds, and the seedlings should be cut and put on the seedlings in time. In order to prevent root rot, keep the ground temperature from falling, promote germination, and generally do not water after cutting. If the temperature is too high, the weather is dry, and the soil is poor, the water can be diverted between the rows or the ditch, and the wet or wet surfaces can be dampened. After irrigating, loosen soil immediately to facilitate warming, ventilation, and protection.
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