What are the key points of Angelica dahurica cultivation and management techniques?
How do you manage Angelica dahurica cultivation? Please provide guidance. For the management methods of Angelica dahurica cultivation, you can refer to the following methods: 1. Thinning and final singling of seedlings. Angelica dahurica seedlings grow slowly, and generally no thinning is done in the year of sowing. After greening up in early spring of the second year, when the seedlings are about 5-7 cm tall, carry out the first thinning, removing the overcrowded and weak seedlings. For drilling...
How do you manage Angelica dahurica cultivation? Please provide guidance
For the management methods of Angelica dahurica cultivation, you can refer to the following methods:
1. Thinning and final singling of seedlings. Angelica dahurica seedlings grow slowly, and generally no thinning is done in the year of sowing. After greening up in early spring of the second year, when the seedlings are about 5-7 cm tall, carry out the first thinning, removing the overcrowded and weak seedlings. For drilling, leave one plant about every 5 cm; for hole sowing, leave 5-8 plants per hole; for the second thinning, leave one plant about every 10 cm or leave 3-5 plants per hole. Around Qingming, when the seedlings are about 15 cm tall, carry out final singling, with a plant spacing of 13-15 cm or leaving 3 plants per hole, staggered in a triangle to facilitate ventilation and light penetration. During final singling, the overly vigorous large seedlings with greenish-white leaf stalks should be pulled out to prevent early bolting and flowering.
2. Intertillage and weeding. This should be carried out together with thinning and final singling. When the leaves gradually grow larger and the bed surface is closed and shaded, there is no need to weed anymore.
3. Topdressing. Angelica dahurica is tolerant of fertilizer, but generally little or no fertilizer is applied before spring to prevent excessive seedling growth and early bolting and flowering. After spring, vegetative growth begins to flourish, and topdressing can be applied 3-4 times. The 1st and 2nd times are both after thinning and intertillage, and the 3rd and 4th times are after final singling and before the rows close. Fertilization should preferably be done on sunny days; it is not suitable to fertilize on the day when it has just cleared after rain or after intertillage and weeding. Fertilizer types can include human excrement and urine, decomposed cake fertilizer, barnyard manure, urea, etc. For the first fertilization, the fertilizer should be light and small in amount, such as applying 10 loads of dilute human and livestock manure per mu, and afterward it can gradually be made stronger and greater in amount, such as 30-40 loads. The application before the rows close can be combined with phosphorus and potassium fertilizer, such as 20-25 kg of superphosphate, to promote thick and strong roots. It has been reported that in the topdressing before the rows close, applying 25 kg of calcium magnesium phosphate fertilizer and 5 kg of potassium chloride, followed immediately by hilling soil, can prevent lodging and promote growth.
The number of topdressings and the amount applied each time can also depend on the growth of the plants. If, when the rows are about to close, the leaves are light green and not very vigorous, one more topdressing can be applied; or if at this time the leaf color is dark green and growth is vigorous, no more topdressing is needed.
4. Drainage and irrigation. Angelica dahurica likes water but fears waterlogging. After sowing, if the soil is dry, water immediately; afterward, if there is no rainy weather, water once every few days to keep the bed surface moist before the seedlings emerge, as this helps emergence; during the seedling stage, the soil should also be kept moist to prevent yellow leaves and the formation of many lateral roots; before the seedlings overwinter, water thoroughly once. Henan has the experience that "wet freezing is best, dry freezing does not easily survive," and Hebei has the experience that "in winter, Angelica dahurica only dies from drying, not from freezing." After spring of the following year, irrigation can be done at appropriate times together with topdressing, especially during the dog days, when sufficient moisture should be maintained. If in the rainy season there is standing water in the field, ditches should be opened in time for drainage to prevent root rot from waterlogging and the occurrence of diseases.
5. Pull out bolting seedlings. In May of the second year after sowing, some plants will bolt and flower. Their roots cannot be used as medicine, and the seeds they produce cannot be used as seed, because the next generation will bolt early. Therefore, in order to reduce the consumption of nutrients in the field, plants found to be bolting should be pulled out in time.
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