What are the common varieties of rhubarb seeds? What are the methods of raising seedlings?

Rhubarb is not only one of the four dimensions in medicine, but also has the laudatory name of "general". It is a very common medicinal material in clinical application. According to traditional Chinese medicine, rhubarb belongs to the spleen, stomach, large intestine, liver and pericardial meridians, with the functions of purging attack and accumulation, clearing heat and detoxification, purging fire and blood, promoting blood circulation and removing blood stasis. At present, rhubarb is planted and distributed in Qinghai, Gansu, Guizhou, Hubei, Shaanxi, Yunnan and other places. So in the process of planting rhubarb, how to select varieties and raise seedlings? Let's take a look.

What are the common varieties of rhubarb seeds?

When planting rhubarb, 3-year-old plants with purer varieties should be selected as seed plants for seed propagation and seedling breeding. There are also many varieties of rhubarb, including palm leaf rhubarb, Tanggut rhubarb and medicinal rhubarb.

1. Palm leaf rhubarb: Palm leaf rhubarb is a tall perennial herb, the rhizome is stout, about 2m high, the leaf is broadly heart-shaped or nearly round, and the diameter is more than 40cm. Inflorescences large paniculate, flowers purplish red or reddish purple. The flowering period is from June to July and the fruiting period is from July to August.

2. Tanggut rhubarb: Tanggut rhubarb is a tall perennial herb with slightly round or broad heart-shaped root leaves, large panicles, thick purple when young, and green-white ones with dense branches. Flowers small, with longer pedicels. The flowering period is from June to July and the fruiting period is from July to September.

3. Medicinal rhubarb: medicinal rhubarb, also known as southern rhubarb and Sichuan rhubarb, with erect stems, sparsely pubescent and dense nodes. Root leaves long stalked, leaf blade orbicular to ovoid. Panicle, large, light green or yellowish white, flowering and fruiting from June to July.

What are the methods of raising seedlings?

1. Land preparation

Choose soil that is deep, loose, fertile and well drained. Combined with deep ploughing and soil preparation, the dominant farm manure 3000kg/667m2 was applied to make the border with a width of 1 to 1.2m.

2. Sowing seeds

In the middle and late July, when most of the seeds turn dark brown, the stems are cut back, dried in the shade, threshed and set aside. Sowing is divided into spring sowing and autumn sowing, and autumn sowing is generally better. After the seeds were soaked in warm water, the seeds were spread evenly in the main trench according to the row spacing 20cm on the border surface, opening the deep and shallow trenches of 5cm.

3. Raising seedlings

The seedling can be trenched horizontally by strip sowing or sowing strip seeding, the furrow distance is 25: 30 cm, the sowing width is 10 cm, the depth is 3: 5 cm, and the dosage per hm2 is 30: 75 kg. Sowing is to spread the seeds evenly on the border, cover the fine soil thinly and cover the grass. After the seedlings come out, weed and water them in time. If the seedlings are too dense, it can be combined with the seedlings of the first weeding. Rarefied human and animal feces and urine were applied for 2 times at seedling stage.

4. Transplanting

Transplant in late March. The medicine seedlings were dug out from the seedling border, and the sturdy and disease-free seedlings were selected, and the row spacing 80cm and plant spacing 60cm were suitable. The rhubarb seeds were placed inward and outward in the pit, and the soil around the pit was thrown down by hand to cover the rhubarb seedlings with a thickness of about 5cm. About 2200 seedlings are preserved per 667m2.

5. Management

In early May, after the emergence of rhubarb seedlings, weeding was carried out for the first time to remove weeds around the pit; in mid-June, after rhubarb reached the three-leaf stage, weeds were removed for the second time, proper soil cultivation, and soil cultivation for the second time in early August; after that, intertillage weeding was carried out at any time depending on the growth of weeds in the field. In late March of the second year, high quality farm manure 4000kg and diammonium phosphate 15kg were applied per 667m2 and mixed in the interrow soil to the base of the stem.

Generally speaking, rhubarb is widely used in clinic, so the market demand is stable and it is loved by traditional Chinese medicine growers. Rhubarb likes cool, shade, cold resistance, avoid high temperature, planting must be combined with the growth habits of rhubarb, and do a good job of seed selection and seedling breeding at the same time.

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