Rehmannia cultivation techniques

Rehmannia, also known as raw land, its root and stem taste slightly sweet, the main component containing iridoids, is divided into sterols, diterpenoids, etc., in addition to a variety of sugar, vitamin a and so on. With Ziyin heat, cooling blood to stop bleeding, governance fever, irritability, spot rash, yin deficiency, fever, diabetes, vomiting, sputum, hematuria, uterine bleeding, sore throat and other effects. With the improvement of living standards, Dihuang has become a table on the pollution-free delicious and fitness cuisine. 1 Production status of ground yellow has sporadic planting in all parts of the county, especially Hecheng Township, Linggen Township and other places planted area of ​​up to 21.9hm2, the average output of 728 kg per 667 square meters, the output value of 1720.40 yuan / 667 square meters, than The growth of sweet potato was 1,264.90 yuan/667 square meters, and the output value increased by 233.73%, which had significant economic benefits. 2 Cultivation Techniques 2.1 Biological characteristics Huang Xiguang has certain drought resistance and cold resistance. Hi-loose, slightly alkali sandy loam, mixed soil and fertile clay can also be planted. Low-lying waterlogged fields, dry lands with too heavy soil and saline land are not suitable for planting. It is recommended to build a grasshopper plant, and it is better to use the grass crop beforehand. The legume crops should not be used for the former crop, otherwise it is easy to cause nematode disease. 2.2 Sowing roots and seedlings for roots, selecting roots that grow robustly and without pests and diseases before the Ching Ming. Cut the roots into 5 cm or so segments containing 3 or more buds. Stir the leaves with a little ash and dry them slightly. On a 1.2-1.5m wide raft, set a ditch at a distance of 30cm, one for every 20cm, pour the dung, and cover the soil. The seedlings were planted on the land that was planted with yellow land. When harvesting, the short rhizomes were intentionally left in the ground until they were germinated and germinated the next year. In the middle of April, the seedlings were transplanted between 10-15 cm long and transplanted. Plant spacing 3020 cm, 2-3 seedlings per plant, planting light human feces. Usually 11,000 plants per 667 square meters. 2.3 Field Management 2.3.1 Base fertilizer and topdressing fertilizer: spread 750-1000 kg of bar fertilizer or 50 kg of cake fertilizer per 667 m2, turn 50 kg of calcium magnesium phosphate fertilizer into the soil before planting, and plant a variety of plots of yellow land in the previous year. Fertilizers are used to spread spasm before emergence, and fertilizers are covered with mud. Generally combined with cultivating and weeding for topdressing, the growth period of Rehmannia usually requires dressing 2 times. The first time from the seedlings to the seedling height 10-15 centimeters, topdressing, applying 50 kg of compound fertilizer per 667 square meters plus 15 kg of urea; the second time in August, the increase in the stem growth of yellow stems, every 667 square meters Potassium sulfate 5 kg plus urea 5 kg, in order to facilitate root growth. 2.3.2 Moisture Management: Ground yellow shouldn't be wet or dry. Before July, it should be properly watered. Roots and stems should be formed after July. Watering should be reduced. When the ground is white, water should be added to avoid overheating. Roots, but if the ground temperature increases after a storm in the weather, it should also be watered to cool, otherwise it will cause root rot of rhizomes, drainage should be promptly after the rain. 2.3.3 Pest control: Pest and disease pests are generally rare. Common pests include spot blight, blight, cyst nematode disease, red spider, and ground tiger. Attention should be paid to the detection and timely prevention and treatment. 2.4 Timely Harvest In the early November of the year when the yellow part of the yellow ground was spotted, the stems and leaves on the ground were cut off on sunny days. Carefully dig out the whole root yellow, remove impurities, and transport it to the market for sale in time.

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