Key Field Management Techniques After Planting Dahurian Angelica
How to manage dahurian angelica after planting? What should be noted? After planting, dahurian angelica can be managed as follows: 1. Thinning and final singling Dahurian angelica seedlings grow slowly, and are generally not thinned in the year of sowing. In early spring of the second year, after the plants turn green again, the first thinning is carried out when the seedlings are about 5-7 cm tall, removing the overly dense and weak seedlings. For drilling, leave...
How to manage dahurian angelica after planting? What should be noted
After planting, dahurian angelica can be managed as follows:
1. Thinning and final singling Dahurian angelica seedlings grow slowly, and are generally not thinned in the year of sowing. In early spring of the second year, after the plants turn green again, the first thinning is carried out when the seedlings are about 5-7 cm tall, removing the overly dense and weak seedlings. For drilling, leave one plant every about 5 cm; for hole sowing, leave 5-8 plants per hole. For the second thinning, leave one plant every about 10 cm or leave 3-5 plants per hole. Around Qingming, when the seedlings are about 15 cm tall, final singling is carried out, 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, large seedlings with excessively vigorous growth and blue-white leaf stalks should be pulled out to prevent premature 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 Dahurian angelica is tolerant of fertilizer, but generally little or no fertilizer is applied before spring to prevent overly vigorous growth during the seedling stage and premature 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 carried out after thinning and intertillage, and the 3rd and 4th times are carried out 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 rain has just cleared or after intertillage and weeding. Fertilizer types can include night soil, 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 later it can gradually be made stronger and increased, such as 30-40 loads. The application before the rows close can be combined with phosphorus and potassium fertilizers, 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 earthing up, can prevent lodging and promote growth. The number of topdressings and the amount applied each time can also be determined according to the plant's growth. For example, if the leaves are light green and not very vigorous when the rows are about to close, another topdressing can be applied; or if the leaves are dark green and growth is vigorous at this time, no more topdressing is needed.
4. Drainage and irrigation Dahurian angelica likes water but fears waterlogging. After sowing, if the soil is dry, it should be watered immediately; afterward, if there is no rainy weather, it should be watered every few days to keep the bed surface moist before the seedlings emerge, which is beneficial for emergence; during the seedling stage, the soil should also be kept moist to prevent yellow leaves and the production of many lateral roots; before the seedlings overwinter, they should be watered 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, dahurian angelica only dies from drying, not from freezing." After spring of the following year, irrigation can be carried out at appropriate times together with topdressing, especially during the dog days when sufficient moisture should be maintained. If there is a rainy season and water accumulates in the field, ditches should be opened in time for drainage to prevent root rot and disease occurrence from waterlogging.
5. Pulling out bolting plants 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 prematurely. Therefore, in order to reduce the consumption of field nutrients, bolting plants should be pulled out in time when found.
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