Seed propagation methods of Robinia pseudoacacia

Robinia pseudoacacia, also known as Sophora japonica, Sophora pseudoacacia, Sophora pseudoacacia, Robinia pseudoacacia, etc., originated in China, is now widely cultivated in the north and south provinces and regions, has strong adaptability, has high planting value, and has many breeding methods, but it is often used for seed reproduction. and the reproduction of Robinia pseudoacacia seeds is not difficult, let's take a look at the seed propagation methods of Robinia pseudoacacia.

Seedling site selection of Robinia pseudoacacia

The seedling land of Robinia pseudoacacia should choose flat, good drainage and irrigation conditions, fertile soil and deep soil layer of loam or sandy loam, which can adapt to neutral, calcareous and slightly acidic soil. Electric energy grows normally in mild saline-alkali soil (salt content is about 0.15%), but poor growth in dry, barren and low-lying waterloam plots.

Seed treatment of Robinia pseudoacacia

1. Seed soaking method: first soak the seeds in 80 ℃ water, stir continuously until the water temperature drops below 45 ℃, place for 24 hours, and take out the expanded seeds. The unswollen seeds were repeated for 2 or 3 times to make them expand. Cover the inflated seeds with a wet cloth or grass curtain to sprout. After 1.5 to 2 days, about 20% of the seeds can be germinated.

2. Sand storage method: the seeds are generally stored 10-15 days before sowing. Before storing the sand, soak the seeds in water for 24 hours so that the water content of the sand reaches 60%, that is, it is held in a ball and is about to be dispersed. Mix the seed sand at a volume ratio of 1:3, put it into a hole dug in advance, and then cover it with plastic sheeting. During sand storage, turn it once a day and keep it moist. 50% of the seeds can be sown when they germinate.

Sowing method of Robinia pseudoacacia

1. Sowing time: spring sowing is generally used, and it is appropriate to sow in the first and middle of April. The sowing rate is 10kg to 12kg per mu.

2. Sowing method: when the ridge is sowing, the distance between the ridges is 70 cm 80 cm, the width of the bottom of the ridge is 40 cm 50 cm, the width of the surface is about 30 cm, the height is 15 cm 20 cm, the sowing width is 10 cm, and the cover is 1.5 cm. It can also be made without ridging, with a row spacing of 60 to 70 centimeters and a sowing width of 5 centimeters. Suppressed after sowing, so that the seeds are closely combined with the soil, and can be covered with film when conditions are available.

Transplanting of fixed seedlings of Robinia pseudoacacia

1. Timely seedling setting: the seeds of Robinia pseudoacacia generally began to emerge in 7-10 days after sowing, and all emerged in 10-15 days. The plastic mulching plot should remove the plastic film when the seedlings grow 2 or 3 true leaves. When the seedling height is 15 cm, the seedling spacing is 10 cm and 15 cm, and the number of seedlings retained is about 8000 plants per mu.

2. Transplanting management: it is generally used for greening seedlings to come out of the nursery for 3 to 4 years. Because the buds at the top of the seedlings are dense, the question distance is short, and the trunk is very easy to bend, the annual seedlings will be transplanted according to the plant spacing of 40 cm to 50 cm and the row spacing to 70 cm in the following spring. After planting, the trunk can be cut off at 3 cm from the ground. Because the locust tree has sprouting power, it is easy to sprout a large number of buds after truncation. When the sprouting shoots grow to about 20 cm, a strong branch upright and upward is selected as the trunk and the rest of the branches are wiped out. In the future, we should pay attention to removing the tillers and removing the side at any time, and temporarily retain the weak lateral branches in the upper, middle and lower parts of the trunk, which is beneficial to prevent the bending of the trunk. In this way, the seedling height can reach more than 3m in the next year.