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

Robinia pseudoacacia is the only tree species named after the word "country" among the garden trees in China, so it naturally becomes the city tree of the capital Beijing. Not only that, the tree shape of Robinia pseudoacacia is tall and beautiful, and the survival rate of transplanting in the four seasons is extremely high. Basically, it can be seen in every city in China. Coupled with the good prospect value, its planting area is even more extensive. So how to plant Robinia pseudoacacia? Let's take a look at the seed selection techniques and breeding methods.

How to select seeds of Robinia pseudoacacia?

Robinia pseudoacacia seeds are black or brown, flat oval, pod, 5 cm to 7 cm long, seed coat green, fleshy. When selecting the seeds of Robinia pseudoacacia, we must use these standards as the basis for careful identification, with a jet-black appearance, full seeds, belonging to the first-class seeds. It is best to choose green seed coat and full fleshy seeds for sowing, so as to effectively improve the germination rate of seeds. In addition, it is best to do germination test before sowing, and check the emergence of seedlings in time after sowing, so as to identify the quality of Robinia pseudoacacia seeds.

What are the methods of raising seedlings?

1. Selection of nursery sites

Robinia pseudoacacia is not strict on the soil, but it is more suitable to choose the place with convenient drainage and irrigation, sandy soil or loam, good soil fertility and flat terrain as the nursery ground.

2. Seed treatment

In order to accelerate the germination rate of Robinia pseudoacacia seeds, the seeds need to be treated before sowing, and the seed soaking method can be used generally. That is, the seeds were immersed in hot water at a temperature of 80 ℃ and stirred continuously. After the water temperature dropped to < 45 ℃, the seeds were stopped and left for 24 h. Then take out the seeds after expansion, cover with grass curtains or wet with water in advance, sow for 36 hours for 48 hours, wait for the seeds to germinate and then sow.

3. Sowing and raising seedlings

The time of sowing is generally in spring. Before sowing, ditches are opened before sowing and then covered with soil about 2cm. Seedlings can be unearthed in about 1 week and all in 10-15 days. If there is plastic film mulching, the film will be removed when the number of true leaves of the seedlings reaches 2-3, and when the height of the seedlings reaches 15cm, it can be carried out twice.

4. Transplant management

The density of branches and buds of Robinia pseudoacacia seedlings is too high, and the trunk should be bent, so it is necessary to transplant after one year of seedling growth in order to increase the row spacing and the number of seedlings, and the row spacing should be controlled at about 45 cm × 75 cm. The first year after transplantation is very critical, which determines whether the seedlings can survive or not, timely watering, ensuring sufficient water, and so on.

Robinia pseudoacacia has always been popular in the market because of its "patriotic factors," and the annual use of large-scale Robinia pseudoacacia in the greening project is 5 million, which adds up to 1 million in the whole country. It can be said that the high-quality Robinia pseudoacacia cultivated at present is very popular in the market, of course, this is inseparable from scientific seedling management technology.

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