According to the sowing time of Radix Isatidis, it can be divided into four stages: autumn sowing, early spring sowing, spring sowing and summer sowing. The purpose of autumn sowing and early spring sowing is to collect seeds. Planting subsidies in these two periods cannot be injected. Sowing in summer is suitable for areas with long plum rains in South China. This method can reduce pests and diseases, but the yield is low. Planting Isatis indigotica in spring can harvest leaves and roots, and high yield is the most commonly used method. Parking fertilizer Isatis indigotica is a deep-rooted plant, so it is best to choose standard soil with flat terrain, good drainage and loose fertility. Add up the ground, turn it shallow once, rake it flat to form a flat bed with a width of 1- 1.5m, and water it before sowing to make the soil moist.

Sowing can be divided into spring sowing and summer sowing. Spring sowing should not be premature. Because the seeds germinate and are affected by the cold current in early spring, they will bloom in Chunhua period and autumn in advance, and they will be ineffective at the end of the growth period of that year. Soak the seeds in 30-40℃ warm water for 4 hours before sowing. Take it out to dry. Both acupoint application and acupoint application are acceptable. Please use blood radio more often. The row spacing of the ditch is 20-30cm and the depth is 1.5-2cm. Mix the seeds and fine sand evenly, cover the soil by 0.5- 1cm, and then compact to keep the soil moist. The distance between the hole sowing line and the plant can be 25 cm. The germination rate of Isatis indigotica seeds is 70%, and it is 65438 0.5 ~ 2kg per mu. The seedling height of Guanmiao field management is 5-7 cm, and the seedling height is 10- 15 cm. The weak liver seedlings should be kept strong, and the mother should be protected in time. At this stage, the soil should be kept moist.

Cultivate and weed in time after germination. After the plants are enclosed for one time, 500- 1000 kg or 10 kg urea and 10 kg calcium superphosphate per mu are not cultivated or weeded, and watered. Every time leaves are picked, 5~7 kilograms of ammonium sulfate water and drainage pipes are applied per mu. Water in time when the weather is dry in summer, and pay attention to drainage in rainy season to prevent root rot. When propagating with seeds, the roots of Isatis indigotica do not bear seeds that year. 65438+ 10 When harvesting Radix Isatidis in late June, under the condition of no plant diseases and insect pests, select the ones with stout main roots, transplant them to fertile fields, water them in time after meals, and strengthen field management. After the seeds are ripe, they are harvested in stages, dried in the sun, threshed and stored in a ventilated and dry place for use. The collected seed roots are lignified and can no longer be used as medicinal materials.

Mainly powdery mildew and root rot, white or gray fungi are produced on the back of leaves when the leaves are light green spots, and the leaves die in severe cases. Root rot mostly occurs in rainy season, which makes the roots rot and leads to the death of the whole plant. Give priority to agricultural prevention and control, reasonably rotate Gramineae and Leguminosae crops, improve ventilation, find out diseased leaves in the field in time and bury them centrally. You can also spray 65% big Sanya tobacco or 77% lean meat moisturizing powder or take root. There are mainly cabbage caterpillars and cabbage caterpillars. Pieris rapae bites the leaves, leaving holes and scratches on the leaves, leaving only veins in severe cases. Cauliflower moths bite leaves, which will produce skylights in the early stage and only leave net veins in the later stage.