Seedling technique of planting Glycyrrhiza uralensis

1. Rotten soil or sandy loam land with deep, fertile and loose soil layer should be selected for seedling raising. Apply 2000 kg of farm manure, 25 kg of superphosphate and 10 kg of potassium sulfate per mu as base fertilizer, ploughing more than 40 cm, leveling and raking fine, and making a 100cm wide flat bed for backup.

2. Licorice seed coat is leathery, shiny and has poor water absorption, so it should be treated before sowing. Sand grinding is generally used in production. Mix licorice seeds and clean river sand at a volume ratio of 1:1, put them into a container, stir repeatedly to rub them, and sow seeds when the seed coat does not shine.

From March to April, four shallow ditches with a width of 10-15 cm and a depth of 1.5-2 cm were opened along the ridge of the border, and the seeds were sprinkled evenly into the ditch. After spraying 800 times of phorate, the fine soil was covered with 0.5-1 cm thick and covered with grass for heat preservation and moisturization. Use 5 kilograms of seeds per mu and cultivate one mu of seedlings, which can be planted in 6 mu of fields. When the temperature is 20 ℃, seedlings can emerge in 5-7 days. When 50% of the seedlings emerge, remove the cover grass and water to preserve moisture, waiting for the seedlings to be completed. When the seedling height is 15ml / 20cm, 20 kg of urea is applied per mu with water, and then the water is controlled to facilitate the root strip to grow into the deep soil layer and cultivate excellent seedlings. Licorice is vulnerable to underground pests such as ground tiger and golden needle worm at seedling stage, especially in waterlogged land and newly reclaimed land. In addition to increasing the amount of methamidophos during sowing, it should be applied again on the 40th and 100th day after sowing, and the dosage should be controlled at 1000-1500 times, irrigating plants or pouring with water. Licorice is prone to powdery mildew in the hot and humid season. First, scattered dotted and cloud-like powdery attachments appeared on the back of the leaves, and then spread to both sides of the leaves, resulting in the early yellowing of the leaves and seriously affecting the quality of the seedlings. The method of prevention and control should focus on the word "early", that is, early detection and early prevention. At the initial stage of the disease, 35% trimethoprim 1000-1200 times liquid spray can be used to prevent and cure the disease, once every 5 days, 3 times in a row. Metalaxyl can also be used for prevention and control. It can be cultivated carefully for one year and can be transplanted in February of the following year.