The planting time of Isatis indigotica is divided into several times, and it can be selected in early spring, spring, summer and autumn. But in order to increase the yield, it is best to plant in spring, and the temperature in this area can usually be kept at 12. The south can be slightly advanced, and the north can be appropriately postponed, which can be carried out in April. Selection of soil for planting method: When planting Radix Isatidis, it is mostly planted in a large area. First of all, we should choose soil, and it is best to use relatively loose and well-drained soil. In addition, some Pica microbial agents and farmyard manure should be added to the soil.

Germination: prepare a basin of clean warm water and soak the full seeds in it for at least 4 hours to soften their shells. The seeds should be dried after being taken out, and there should be no impurities in the seeds. Planting: Sow the seeds into the prepared soil, and then cover the seeds with a layer of 1cm soil. It needs water to grow, so it should be watered properly, but there must be no water. Finally, just wait for it to appear. Isatis indigotica, Isatis indigotica, Isatis indigotica, Isatis indigotica and Isatis indigotica are biennial herbs in Cruciferae. Radix Isatidis is a root medicine, which is only collected once a year, and Folium Isatidis is a leaf medicine.

Roots and leaves are bitter and cold. Has the functions of clearing away heat and toxic materials, cooling blood and removing spots. Venue: Anguo, Hebei, Nantong, Jiangsu. Widely introduced and cultivated in China. Cultivated in Heilongjiang province, it can be planted as an annual plant, but generally it can't overwinter. In order to obtain seeds, roots are collected and stored in vegetable cellars in autumn. You can sow in the second year. I like mild and humid climate, I am cold-resistant and afraid of waterlogging, and my roots are easy to rot after flooding. I don't have high requirements for soil, so I can generally plant them. Continuous cropping has sufficient base fertilizer.

But sandy loam with good drainage is more suitable. (1) Soil preparation and fertilization Isatis indigotica is a deep-rooted plant, and the soil with deep and loose soil layer is selected. Applying 3000 ~ 4000 kg of ring fertilizer, 0/5 kg of diammonium phosphate/kloc-and 4 kg of biological potassium fertilizer per mu, spreading it evenly in the ground, turning over 30 cm deep, is beneficial to the straight growth of roots without bifurcation. Then make a flat land with a width of 1 meter for sowing. (2) Sowing in early April and late May in summer. Might as well drill. Before sowing, soak the seeds in 40 warm water for 4 hours, sprinkle with plant ash and mix well.