How to manage Angelica dahurica with high yield

1. Thinning and fixing seedlings:

Angelica dahurica seedlings grow slowly, generally do not sparse seedlings in the first year of sowing, after the second year of early spring, seedlings about 5-7 cm high for the first time thinning seedlings, occasionally over-dense thin seedlings. For drilling, leave one plant at intervals of about 5 cm, for hole seeding, leave 5-8 plants per hole; for the second thinning, leave one plant at intervals of about 10 cm or 3-5 plants per hole. Before and after Qingming seedling height of about 15 cm when the seedlings, plant spacing 13-15 cm or 3 per hole, triangular staggered, in order to facilitate ventilation and light transmission. When determining seedlings, large seedlings with excessive growth and bluish white petioles should be pulled out to prevent early flowering.

II. Cultivation and weeding:

It is best to combine thinning and fixing seedlings simultaneously. When the leaves grow up and the ridge surface is closed, there is no need to weed again.

Third, topdressing:

Angelica dahurica is a relatively fertilizer-tolerant crop, but generally before spring should be less or no fertilizer, in order to prevent seedling growth too prosperous, early flowering. After spring, nutrient growth begins to flourish, and topdressing can be applied 3-4 times. The first and the second time are carried out after thinning and intertillage, and the third and the fourth time are carried out after seedling determination and before ridge sealing. Fertilization should be carried out on sunny days, and fertilization should not be carried out on the day after rain or weeding. Fertilizer types can be selected from human manure, decomposed cake fertilizer, manure, urea and so on. For the first time, fertilizer should be thin and less, such as 10 loads of diluted human and animal manure per mu, and gradually increase the concentration later, such as 30-40 loads. Before closing the ridge, phosphorus and potassium fertilizer can be applied once, such as calcium superphosphate 20-25 kg, to promote root thickening. It has been reported that 25 kg of calcium magnesium phosphate and 5 kg of potassium chloride were applied in a topdressing before ridge closure, and soil cultivation immediately after application could prevent lodging and promote growth. The number of topdressing and the amount of fertilizer each time can also be determined according to the growth of the plant. If the leaf color of the plant is light green and not too vigorous when the ridge is about to be closed, topdressing can be performed again, or the leaf color is dark green and the growth is vigorous, so it can not be chased.

IV. Drainage and Irrigation

Baizhi likes water, but is afraid of standing water. After sowing, if the soil is dry, it should be watered immediately. If there is no rainy day, it should be watered once every few days to keep the ridge surface wet before the seedlings emerge, so as to facilitate seedling emergence; The soil should also be kept moist at seedling stage to prevent yellow leaves from appearing and more lateral roots from being produced; The seedlings should be watered thoroughly before overwintering. Henan has the experience of "wet freezing is best, dry freezing is not easy to live," Hebei has the experience of "Angelica dahurica only dies in winter, but does not freeze to death." After the spring of the following year can be combined with topdressing timely irrigation, especially in the hot days should maintain sufficient water. In case of rainy season, ponding in the field, ditch drainage should be timely to prevent ponding rotten roots and diseases.

5. Remove the sprouts

In May of the second year after sowing, some plants will sprout and bloom. Their roots cannot be used for medicinal purposes, and their seeds cannot be used as seeds, because their next generation will sprout ahead of time. Therefore, in order to reduce the consumption of nutrients in the field, the plants found to sprout should be removed in time.