Sophora japonica is a native tree species with a long history of cultivation in my country, and it is also an excellent tree species for urban and rural greening. Due to the slow growth of the seedling stage of P. pseudoacacia and the longer period of cultivating large seedlings, the large seedlings of P. pseudoacacia are in short supply. Using nutrient bowls to raise seedlings and increase the row spacing to cultivate large seedlings of Chinese Sophora japonica has better performance. The specific technology is as follows:
Land selection and site preparation Choose a neutral sandy loam with fertile soil and convenient irrigation and drainage as the nursery. When preparing the soil, apply foot fertilizer. Generally, 50 kg of farm manure, phosphate fertilizer and cake fertilizer are applied per acre, and 0.75-1.25 kg of 30% carbofuran is used for soil treatment. After plowing and raking, it is made into a flat bed with a width of 1 meter.
Soak the seeds in early March, put the seeds in warm water at 80°C, and stir them until the water temperature drops to 40°C. Then remove impurities and continue soaking for 2-3 days. When soaking, pay attention to changing the warm water at 30℃ twice a day.
Seedlings in nutrient bowls Choose a place with a flat terrain, good drainage and leeward to the sun. Dig a pond with a width of 1-1.5 meters and a depth of 30-40 cm as a seedbed. Use sandy loam soil plus sieved farmyard manure as nutrient soil, and use cotton pots to make bowls. Place the nutrition bowl in the bed and sprinkle water evenly. Then, put 2-3 seeds in each pot, sprinkle 1 cm thick moist fine soil on the top, and cover it with a plastic film arc. The temperature in the bed is controlled below 40°C and the bed surface is kept moist. When the height of the seedlings is 15-20 cm, the seedlings are refined for 3-5 days, and then they can be transplanted in the field.
Seedling management After the Chinese locust seedlings are transplanted and survived, they must be cultivated and weeded, loosened soil to protect moisture, and watered if necessary. 15 kg of urea per acre of land should be topdressed, and the seedlings of the year can be as high as 2.5 meters. Two-year-old and three-year-old seedlings grow faster, and 50 kg of cake fertilizer should be applied per acre in spring each year, and urea topdressing 2-3 times in summer, 10 kg per acre each time. In addition, we must strengthen the prevention and control of plant diseases and insect pests to ensure the healthy growth of seedlings.