How to choose the seeds of Catalpa chinensis? What are the methods of raising seedlings?

Catalpa tree, alias catalpa tree, jilin tree, tung tree, is the main species of reserve forest in our country, but also one of the precious wood in our country. Catalpa tree material is good, high toughness and high corrosion resistance, growth speed, up to 3 cm a year, garden can be used for street trees, ornamental trees can purify the air, is one of the excellent tree species to improve the environment of green cities. How do you choose tree seeds? What are the breeding methods? Let's take a look at it together with Xiaobian.

How do you choose tree seeds?

Catalpa tree in 15-30 years of strong mother tree seed collection, when the fruit from yellow green to gray brown, the top of the crack, indicating that the seed is mature, can be cut off small fruit branches, pick fruit. Sowing in spring in March, soaking seeds in warm water of 30 DEG C for 4 hours before sowing, taking out and drying, mixing with wet sand 3-5 times of seeds evenly, stacking in the house for germination, watering regularly and stirring to make the internal and external temperatures uniform. After about 10 days, 30% of the seeds can be sown when the mouth is cracked.

2 What are the breeding methods of Catalpa trees?

1. Seedling propagation

Seedling propagation should be in 15~30 years old healthy mother tree seed collection, when the fruit from yellow green to gray brown, the top can be picked when the crack. The seed emergence rate of Catalpa bungeana is about 10%, the seed purity is generally 75%~80%, the germination rate is 40%~50%, the seed weight is 4~ 5 g, the seeding amount per mu is 1~ 2 kg, and the seedling yield per mu is 15,000.

2. Root burying seedling

Catalpa bungeana L. has low seed yield and difficult seed collection, but it has strong tiller germination. Buried root seedling is one of the main propagation methods. Root strips come from roots and seedlings of big trees. Cut 1~2cm thick root strips into 15~ 20cm long sections, cut them in winter, and store them in sand if they are planted in spring. When burying roots, insert the big head upward into the soil. If the big head cannot be distinguished, bury it horizontally in the soil, cover the soil with 1~1.5cm, and compact it.

3. Cutting seedlings

Cutting is to use mother root tillers and 1 year old seedlings as seed cuttings, cut into 15~20cm long sections, store the cuttings in sand in winter, take out cuttings in March ~ April, the seedling height of the year can reach 1~ 1.5 m, if treated with ABT1 rooting powder, the effect is better.

4. Grafting propagation

Both winter and spring can be carried out, bud grafting from spring to late autumn can be carried out. In winter, the rootstock is dug out and grafted indoors. After grafting, it is stacked neatly indoors or in a kiln. The wet sand is stored to promote the joint healing. Transplanted in early spring, plant spacing 1×0 4m, 1 500 ~ 2 000 plants per mu. Grafting before and after "Qingming" in spring is good. In nursery land with stubble, with grafting, with soil sealing, grafting survival rate is generally about 90%. grafting methods

Grafting is mainly split grafting and bud grafting. The scion should be cut off at 25px and 3~ 125px, and the lower part should be cut into wedge shape with inlet for grafting. Cut the scion 3~ 125px away from the ground, select a smooth surface and split it 3~ 125px deep along the pith. When pulling out the knife, pinch the scion with your thumb and index finger and insert it into the knife edge. Note the cambium alignment of scion and rootstock. If the rootstock and scion clip is not tight, it can be tied with hemp rope and plastic strips, and then the wound is sealed with wet soil. 10~15 days can sprout and shoot. Bud grafting is mainly embedded bud grafting.

The above is the introduction of catalpa tree, catalpa tree is one of China's precious tree species, beautiful tree shape, large color Yan, often for garden viewing. Its material is good, wide use, high economic value, ranking first among all trees, mainly produced in Hebei, Shanxi, Shaanxi, Gansu, Jiangsu, Zhejiang and other places in China. Cultivated in Guangxi, Guizhou and Yunnan.

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