Seedling raising techniques of Glycyrrhiza uralensis

Select sand and loam with low groundwater level and deep soil layer, but it must be water land. When the surface temperature reaches 15 ℃, 3000 kg of farm manure and 40 kg of American diamine or phosphorus nitrate are applied per mu, and then 40-50cm is ploughed deeply (otherwise there are many short branches of seedling roots, up to less than the prescribed quality standard), and the flat bed is watered once, and the amount of water is to make the soil reach the state of black soil moisture. (that is, after picking it up by hand and throwing it into a cake without scattered shape), after three or five days of shallow ploughing, you can open a ditch and sow the seed, according to the strip sowing method, the row spacing is 20-25cm, and the common valley is used to raise seedlings with 5-6 kg per mu, suitable temperature and humidity, and seedlings can emerge after 5 days. During the seedling raising period, it is necessary to loosen the soil and pull up the grass frequently. The seedlings generally emerge in 80000-120000 plants and can be transplanted to 6-10 mu. The seedling field must remember not to use nitrogen fertilizer and urea. Because of its burning, the seedlings are generally watered before planting, and the growing period does not need to be watered. And drainage measures should be done well, the time is from May to July, and May is the best.