Key points of planting techniques of Rehmannia glutinosa

Rehmannia glutinosa, also known as Rhizoma Rehmanniae, is used for medicinal purposes. It has the effects of cardiotonic, diuretic, analgesic, hypoglycemic and liver protection. It can be cultivated all over the country. How to plant Rehmannia glutinosa? The main points of planting methods of Rehmannia glutinosa are introduced below: first, land selection and soil preparation. It is appropriate to choose sandy loam with deep, fertile and good drainage. Turn the soil more than 25 cm deep in the first winter or early spring and apply 2000-3000 kg of rotten compost per mu and 25 kg of superphosphate as base fertilizer. Then, leveling and raking fine to make the border, the general width of the border is 1.3 meters. Special attention should be paid to the fact that Rehmannia glutinosa should not be replanted, which is also a key measure that should be paid attention to in the selection of land. Second, select and plant. Generally cultivated Rehmannia glutinosa uses rhizome as propagation material, which is called & # 39; planted & # 39; Rehmannia glutinosa & # 39; planting & # 39; generally selected & # 39 planted in July-August of the previous year; inverted & # 39; planting & # 39; this is because & # 39; inverted & # 39; planting & # 39; when used as a seed, Rehmannia glutinosa has high yield, good quality and can prevent variety degradation. Before planting, cut off the head and tail of the plant and take the middle section. Then cut into small sections 3-6 cm long, each section should leave two to three bud holes, the incision should be stained with plant ash, and then planted after slightly drying, generally planting density row spacing 30-40 cm, plant spacing 25-30 cm, dig a hole 3-5 cm deep on the whole border surface, put each hole horizontally & # 39, cover 1-2 sections with dung water, cover with fine soil cover and border. It needs 40-60 kg per mu. Note that when selecting seeds, try to use & # 39; inverted & # 39; planting & # 39; avoid using small commodities; at the same time & # 39; remove & # 39; old mother and son & # 39; That is, it was planted in the first ten days. Picture of Rehmannia glutinosa. 3. Field management. ⑴ was used to replenish seedlings in time. When the height of the seedling is 10-12 cm, the seedlings begin to grow, leaving 1 strong seedling in each hole. In case of lack of plants, it should be replanted in time in cloudy days, and seedlings should be raised with soil when replanting, so that the survival rate is higher; ⑵ ploughing and weeding. The rhizome of Rehmannia glutinosa was shallowly buried in the soil, and the middle tillage should be shallow to avoid root damage. The weeds around the seedlings should be pulled out by hand, and after the plants were closed, the middle tillage should be stopped; ⑶ topdressing. Rehmannia glutinosa likes fertilizer. In addition to applying sufficient base fertilizer, 100kg of superphosphate and 30kg of rotten cake fertilizer are applied per mu after interseedling to promote the development and expansion of rhizome. When the row is closed, fire soil ash is applied once between rows to promote the healthy growth of plants; ⑷ irrigation. Rehmannia glutinosa needs a lot of water in the early stage, so it should be watered frequently, and in the later stage, it is the period of underground rhizome expansion, so water should be saved. In the rainy season, we should pay attention to timely drainage to prevent the occurrence of root rot; ⑸ remove bark roots. In addition to the main root, Rehmannia glutinosa can also grow slender underground stems along the surface, called string bark roots, which lose a lot of nutrition and should be eradicated in time. Pay attention to the prevention of diseases and insect pests. The diseases of Rehmannia glutinosa are mainly spot blight, ring disease and Fusarium wilt, which generally begin to occur in early May and are serious from June to July, so we should pay attention to timely control; pests include red spiders, ground tigers, grubs and so on, which are treated according to conventional methods. pay attention to avoid the use of highly toxic pesticides when choosing pesticides. Fifth, harvest and processing. Rehmannia glutinosa planted in spring should be picked in time when the aboveground stems and leaves are withered and yellow around November of that year. When digging, you should open a 35-centimeter deep trench at one end of the border and carefully pick the rhizome in turn; processed Rehmannia glutinosa uses a special oven to process it into cooked land, that is, into a commodity.