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 land, apply foot fertilizer. Generally, 50 kg of farm manure, phosphate fertilizer and cake fertilizer are applied per mu of land. Use 30% carbofuran 0.75 to 1.25 kg for soil treatment. After plowing and rake leveling, it is made into a width of 1 meter. Flat bed.
Seed soaking 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 to soak for 2 to 3 days. Be careful to change the warm water at 30℃ twice a day when soaking.
Nutrient bowl seedlings Choose a place with a flat terrain, good drainage and sunny leeward, and dig a pond with a width of 1 to 1.5 meters and a depth of 30 to 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 to 3 seeds in each pot, sprinkle 1 cm thick moist fine soil on the top, cover it with a plastic film arc, control the temperature in the bed below 40 ℃, and keep the bed surface moist. When the height of the seedlings is 15-20 cm, the seedlings are tempered for 3-5 days, and then they can be transplanted in the field.
Seedling management After the Chinese Sophora seedlings are transplanted and survived, they must be cultivated and weeded, loosened soil to protect moisture, and watered if necessary. 15 kg of urea is topdressed per mu of land. The seedlings can be as high as 2.5 meters or more. Two-year-old and three-year-old seedlings grow faster. Each spring, 50 kg of cake fertilizer is applied per mu of land, and urea is topdressed 2 to 3 times in summer, with 10 kg per mu each time. In addition, we must strengthen the prevention and control of plant diseases and insect pests to ensure the healthy growth of seedlings.