How to manage Angelica dahurica in field planting

1. Interseedling and fixed seedling

Angelica dahurica seedlings grow slowly, generally not thinning seedlings in the year of sowing. After turning green in the early spring of the second year, the seedlings are carried out for the first time when the height is about 5mi 7cm, and the thin seedlings are too dense. Strip sowing leaves one plant every 5 cm, hole sowing leaves 8 trees per hole, and the second seedling leaves one plant every 10 cm or 3 trees per hole. When the height of the seedlings is about 15 cm before and after the Qingming Festival, the distance between the plants is 15 cm or 3 plants are left in each hole, which are staggered in a triangle to facilitate ventilation and light transmission. When fixing the seedlings, the large seedlings with overgrown growth and bluish-white petioles should be pulled out to prevent early bolting and flowering.

two。 Intermediate ploughing and weeding

It should be combined with inter-seedling and fixed seedling at the same time. When the leaves grow up and the ridges on the border are closed, there is no need to weed.

3. Topdressing

Angelica dahurica is tolerant to fertilizer, but it is usually applied little or not before spring to prevent overgrowth at seedling stage, bolting and flowering ahead of time. The vegetative growth began to flourish after spring, but topdressing 3 Mel for 4 times. The first and second times were carried out after inter-seedling and intertillage, and the third and fourth times were carried out after seedling setting and before ridge closure. Fertilizer application should be carried out on a sunny day, and it is not suitable to apply fertilizer on the day after rain or weeding. Fertilizer types can choose human feces and urine, rotten cake fertilizer, ring fertilizer, urea and so on. When applying fertilizer for the first time, the fertilizer should be thin and less, such as 10 piculs of rare human and animal manure per mu, and then it can be thickened and increased gradually, such as 30 piculs and 40 piculs. One time before the ridge closure can be combined with the application of phosphorus and potassium fertilizer, such as calcium superphosphate 20ml 25kg, to make the root stout. It has been reported that 25 kg of calcium magnesium phosphate fertilizer and 5 kg of potassium chloride are applied in a topdressing before ridge sealing, and the soil is cultivated immediately after application, which can prevent lodging and promote growth. The number of times of topdressing and the amount of fertilizer applied each time can also be determined according to the growth of the plant. If the leaf color of the plant is not very exuberant when the ridge is about to be closed, you can topdressing again, or at this time the leaf color is thick green and the growth is exuberant, but no more topdressing.

4. Drainage and irrigation

Angelica dahurica likes water, but is afraid of stagnant water. After sowing, if the soil is dry, it should be watered immediately, and in the future, if there is no rain, it should be watered every few days to keep the border surface moist before the seedlings are unearthed, so as to facilitate seedling emergence; the soil should also be kept moist at the seedling stage to prevent the emergence of yellow leaves and produce more lateral roots. Seedlings should be watered thoroughly before overwintering. Henan has the experience of "wet freezing is best, but dry freezing is not easy to live". Hebei has the experience of "Angelica dahurica After the spring of the following year, it can be irrigated with topdressing, especially in summer days. If there is stagnant water in the field in the rainy season, ditches should be opened in time to prevent stagnant water from rotting roots and diseases.

5. Pull out the moss seedling

In May of the second year after sowing, some plants will bolt and blossom, their roots can not be used for medicinal purposes, and their seeds can not be used for seed, because the next generation will bolt ahead of time. Therefore, in order to reduce the consumption of nutrients in the field, the plants found to be bolting should be pulled out in time.