How to plant Angelica sinensis?

How to grow angelica? Please give guidance on planting angelica can refer to the following methods: The transplanted seedlings were loosed and weeded 3~4 times a year for the first time when the seedling height was 3~ 5 cm. After intertillage and weeding, topdressing is applied. For the first time, 1500~2500kg of thin human and livestock manure is applied every 667 square meters; for the second and third times, 2500~3000kg of decomposed manure, compost or ash is applied every 667 square meters. Remove bolting seedlings in time, water in dry weather, but prohibit watering later, so as not to cause rotten roots. Early bolting problem: the key problem of Angelica sinensis in production is early bolting (transplantation year). Generally, the early bolting rate is 30%, and serious ones can reach more than 50%. Bolting angelica root firewood, smell light, lack of oil, poor quality, can not be used as medicine. The reason for early bolting of Angelica sinensis is that there are two developmental stages from non-bolting to bolting: vernalization stage and illumination stage. The former requires a low temperature of 0~5℃, while the latter requires a long day of more than 12 hours. Under natural conditions, low temperatures come from winter, and long days are required around summer. Annual angelica, long sunshine in the summer of that year can pass, do not bolt because there is no winter low temperature. However, not all the seedlings stored in winter can bolt and bloom through vernalization process. Angelica sinensis seedlings also need enough sugar through vernalization process. Enlarged seedlings are easy to bolt, while small seedlings are not easy to bolt. In order to reduce the early bolting of Angelica sinensis, the seedling technology was improved to control the size of seedlings and achieve the goal of bolting control. A number of technical measures could be taken: First, it is appropriate to select the seedling site in the cold mountain area with semi-shady slope and medium soil fertility; or postpone the sowing and seedling period, control the seedling age within 70 days; and make the seedling root diameter about 3.5mm. The method of direct seeding after the beginning of autumn can also be adopted to make the early bolting rate very low. Second, when transplanting in the second year, it is best to plant in deep, loose, fertile and well-drained land. After the seedling is slowed down, the fertilizer and water management should be strengthened to make the seedlings grow strong and the roots obtain a large number of assimilation products, so as to improve the yield and quality of medicinal parts. Third, frozen seedlings will be stored in the seedlings after the low temperature of about-10 ℃, until the following spring planting. Because the seedlings could not get the necessary conditions for vernalization, the stage change could not be realized, and the bolting rate decreased. Click for more Angelica planting techniques Click for more Angelica planting techniques