Planting Techniques of Rehmannia 20, Planting Techniques of Rehmannia Rehmannia

Rehmannia prefers loose and fertile sandy loam, and clay red loam, yellow loam or paddy soil is not suitable for planting. Rehmannia is a light-loving plant, and the planting land should not be close to the forest edge or intercropped with tall crops. When the soil temperature is 11 13, the emergence of seedlings should be 30 45 days, 25 28 is the most suitable for germination, if the soil moisture is suitable in this temperature range, germination one week after planting, 15 20 days of soiling; 8 The following rhizomes cannot sprout.

Rehmannia (Latin name: Rehmanniaglutinosa (Gaetn.).It is a perennial herbaceous plant of the family Radix Radix Radix with a height of up to 30 cm, with fleshy rhizomes and yellow when fresh, and purple-red stems under cultivation conditions.

The diameter can reach centimeters, the leaves are ovate to oblong-elliptic, the veins are concave above, the flowers are slightly arranged into racemes at the top of the stem, the corolla is purplish-red on the outside, yellowish-purple on the inside, the chamber is rectangular, the capsule is ovate to oblong-ovate, and the flower-fruiting period is from April to July.

Plane back the wild foxglove, cut it into 5-7 cm pieces, ditch it and sprinkle it into the soil, covering it with a thickness of 3 cm. If the ground is dry, sit on water. After the emergence of seedlings, it is cultivated and weeded. In the rainy season, apply less urea for top dressing.

Rehmannia is a light-loving plant. In general, wild rehmannia also grows on sunny hillsides and massifs. The choice of planting site is the basic condition for the high yield of Rehmannia rehmannia, so we can choose the planting site according to the growth habit of Rehmannia rehmannia.

It is best to be able to plant in plots with sufficient sunshine, good water storage and drainage, loose and dry soil texture, and rich organic matter.

Expose the roots inside and remove them one by one. The freshly dug root can be used as fresh rehmannia in the market**, if it is to be processed into rehmannia, it must be baked and baked out of dry rehmannia; Rehmannia also needs to be distilled with raw rehmannia and rice wine, and then dried. After the emergence of seedlings, it should be watered less, and it is advisable to keep the loess, and the principle of watering the rehmannia is three watering, and three watering is:

Drought resistance watering before emergence, watering after fertilization, drought and no rain for a long time, and watering at noon when the plant withers. Three do not water, do not water, do not water if the weather is not dry, do not water when the temperature is high at noon, the ground temperature is low, and do not water when the weather is cloudy and rainy.

Stagnant water should be removed in time after rain or watering. Rehmannia is generally planted in mid to late March. When planting, cut the roots and stems of Rehmannia into small pieces of about 5 cm.

Each segment has more than 2 eyes, and the ends of the incision are dipped in vegetable ash. Rehmannia has high requirements for water, different growth times have different water requirements, the initial growth of water requirements is larger, to water frequently, keep the soil moist, the later underground root expansion period, less water requirements, keep the soil dry, but also to prevent waterlogging and root rot after rain.

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To choose the right variety, in the planting process must be put in water soaked in water for about two days, and then to choose fertile and well-drained soil, to choose the right time, you can choose to plant in April, planting must pay attention to density and depth, and then the temperature in the planting process should be controlled at about 23 degrees, to water in time, do a good job of insecticide and weeding.

Rehmannia should be planted in a place with relatively flat terrain and sufficient sunlight, and at the same time, the soil should be relatively fertile, the water should be sufficient, and chemical fertilizers should be applied and watered appropriately.

Buy the seeds of Rehmannia and then find a piece of fertile soil, dig a pit in the soil, put in fertilizer, add water, and put in the seeds.

Propagation method: mainly propagated with tuber roots, but also by bud propagation.

First, pick up seedlings: good seedlings are when the seedlings grow to 10 cm - 15 cm, we have to pick up some weak seedlings, diseased seedlings are cleaned up, in the seedlings at the same time, we also have to pick the top, which can reduce the consumption of nutrients, the growth of fleshy roots is very helpful. It was planted when the average daily temperature reached 13, and the suitable planting period was from 1 to 21, in the first half of April in Beijing, in March in Chongqing, in early spring and mid-April in Henan, and from late May to early June.

Choose fresh disease-free, coarse tuber roots, cut into 5-6cm small sections for seed wood, preferably with planing. When the soil is fertile, 50,000 plants are planted per 1 hectare; When the soil is thin, 10,000 plants are planted per 1 hectare. When planting, make a ditch on the ridge or furrow, the ditch spacing is 33cm, put a section of seed wood every 15-20cm, cover the soil 3-4cm, and water after compacting the topsoil.

After planting, cover with mulch, the effect is better. This is conducive to root reproduction.

Second, cultivating and weeding: when the seedlings just grow out, they need to be weeded, weeds and seedlings will compete for nutrients, so the weeds should be cleaned up in time, and the cultivation is normal when the seedlings grow to the middle stage, that is, before flowering, we want to cultivate the loose soil, which can ensure that the soil is soft and aerating, which is very helpful for the root growth of rehmannia roots.

3. Watering: Rehmannia needs water in the early stage of growth, so it is necessary to pay more attention to watering after the emergence of seedlings, but when it grows to the later stage, that is, when the fleshy roots are expanded, it does not need much water. When the sprout is propagated, when the seedling height is 7-12cm, the young seedling is broken off from the mother plant (seed stem) and planted immediately.

This method saves roots and labor.

Fourth, fertilization: Rehmannia should use more phosphate fertilizer and potassium fertilizer when fertilizing, these two fertilizers are very good for the abundant yield of Rehmannia Rehmannia, and urea should be watered at the same time after the seedlings emerge.

15 kg (per acre). When Rehmannia grows to July, 10 kg to 20 kg of phosphate fertilizer per mu is used.

Rehmannia is mainly propagated by rhizomes. Seed propagation is mostly used in the cultivation of new varieties. The rhizome used for planting is used in the inverted planting method, cellaring and wintering in the spring rehmannia open ground, etc., but the yield of rehmannia seeds with the inverted planting method is high.

The specific method is to plant in the spring of the year in July and August, select the rhizomes that grow robust and free of diseases and insects, dig up and fold them into 4 5cm short joints, after a little air drying, according to the row spacing of 10 30cm, the plant spacing of 5 10cm, replant into a piece of land with full application of foot fertilizer, proper weeding, top dressing, pay attention to drainage after rain, and dig and plant in the spring of the second year. Rehmannia is generally best planted when the average daily temperature is 18 21. Chongqing in late February to late March, Henan early spring rehmannia in early April and mid-April; Evening rehmannia (or rehmannia stubble), from early May to early June.

When planting, make a ditch on the ridge or furrow, the ditch spacing is 33cm, every 15 20cm, put a section of planting, cover the soil 3 4cm, and water after compacting the topsoil. Plant 2 rows per ridge, 3 4 rows per furrow, after the seedlings emerge, choose rainy days to supplement the seedlings, evenly seedling about 1 month after planting, leave 1 healthy seedling per hole, before sealing the row, shallow 2-3 times, and shovel away the excess seedlings that grow one after another.

There are three main ones. The first method is bud propagation, the second method is root propagation, and the third method is rhizome propagation. Among them, the planting technology is based on the third technology, must be planted in the way of inverted planting, so that the yield can be improved, the planting time can be selected from July to August, the row spacing should be kept 10 30 cm, the soil must be selected with fertilizer, after the rain must pay attention to clean up the stagnant water, and then more ventilation.

Propagation techniques include seed propagation, bud propagation, rhizome propagation, cuttings propagation, breeding propagation, etc., which can play a very good role and are also more commonly used methods.

First of all, it is necessary to grasp the appropriate planting method, which is generally divided into asexual reproduction, as well as seed reproduction, before planting and propagation, the seeds must be soaked, and at the same time, we must choose a good variety, and you can also choose the method of reverse planting, and then we also need to strengthen field management and water and fertilizer management, and timely weeding.

The first is to choose a well-drained sandy land, the soil should be sunny, fertile and loose, and the second, when planting, the soil should be turned 30 cm deep, then fertilizer should be applied, and then deep ploughing, and the rake should be leveled.

Third, when selecting seeds, we should choose plants without disease, grow strong, after selection, fold them into small sections of about five centimeters to dry for 1 to 2 hours, so that the wound heals and then come to sow seeds, one acre with about 100 kilograms of seeds, after sowing, cover the soil 5 to 7 centimeters, watering.

Fourth, when fertilizing, more phosphorus and potassium fertilizers should be applied, and sufficient basal fertilizer is also very important for yield, and top dressing should be carried out at the same time as watering.

Fifth, weeding in time.

Rehmannia is also known as Rehmannia and Rehmannia and Rehmannia and belongs to the genus Rehmannia in the family Radix Radix Radix. Its rhizome is used as medicine, which has the effects of cardiotonic, diuretic, analgesic, hypoglycemic, and liver protection. It can be cultivated all over the country. The main technologies and key production measures for the high-yield cultivation of Rehmannia are as follows.

Land selection and land preparation. Choose a deep, fertile, well-drained sandy loam soil. In the first winter or early spring, the soil is deeply cultivated by more than 25 cm, and 2000-3000 kg of decomposed compost and 25 kg of superphosphate are applied as base fertilizer per mu at the same time.

Then rake flat, carefully plant the bed, the bed width is generally meters. In particular, it should be noted that Rehmannia is not suitable for continuous cropping, which is also a key measure to pay attention to when selecting land.

Selection and planting. Generally, the cultivation of Rehmannia rehmannia uses rhizomes as propagation materials, which is called sowing production.

Rehmannia is generally planted upside down, and the seeds were cultivated in July-August last year. This is because when the seeds are planted upside down for use as seeds, Rehmannia has a high yield, ***, which prevents the degradation of the variety. Before planting, cut off the head and tail of the fish and take the middle part of the planter.

Then cut into 3-6 cm long segments, each segment should have two to three bud holes, the incision should be dipped in grass and wood ash, and the seeds should be dried and sown. Generally, the density of simple planting is 30-40 cm in row spacing, 25-30 cm in plant spacing, and small holes 3-5 cm deep should be dug in the entire furrow surface, and 1-2 sections of sowing should be placed horizontally in each hole to cover the fire mixed with manure and water. 40-60 kg sown per acre.

Pay attention to backward planting and sowing seeds, and avoid using small commodities. At the same time, the sowing should be removed, the old mother and the child should be sown in the first half of the year.

Field management. 1. Timely thinning and replanting. When the seedlings are 10-12cm high, start to thin the seedlings, and leave a strong pat seedling in each hole. In case of lack of plants, it should be replanted in time on cloudy days, and soil seedlings should be brought when replanting, and the survival rate is high;

2.Tillage and weeding. The rhizomes of Rehmannia are shallow in the soil, so the cultivation should be shallower so as not to damage the roots. Weeds around the seedlings should be pulled out by hand, and cultivation should be stopped after the plants are sealed.

3.Topdressing. Rehmannia likes fertilizer, in addition to applying sufficient base fertilizer, 100 kg of superphosphate per mu and 30 kg of rotting cake fertilizer are applied per mu after thinning to promote the growth and expansion of rhizomes. When sealing the soil, apply fire soil ash once between the rows to promote the vigorous growth of plants;

4.Irrigate. Rehmannia needs a lot of water in the early stage, and it needs to be watered in Qinying, and in the later stage, it is the period when the underground rhizomes are expanded, so it is necessary to save water. Pay attention to timely drainage in the rainy season to prevent root rot;

Prevention of pests and diseases.

The main diseases of Rehmannia are spot blight, ring striation disease and blight. These diseases generally begin to develop in early May, and the onset is severe in June and July, so it is necessary to pay attention to timely control. There are pests such as red spiders, ground tigers, grubs, etc.

It should be handled in a conventional way. When choosing pesticides, be careful to avoid the use of highly toxic pesticides.

Harvesting and processing. Planting rehmannia should be harvested in time when the stems and leaves on the ground turn yellow around November of that year. When digging, a deep trench of 35 cm should be made at one end of the furrow and the roots should be carefully picked in order; Processed rehmannia will be processed into rehmannia in a special oven, that is, a commodity.

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