Scientific planting techniques of Angelica dahurica

1. Land preparation

Apply rotten compost or barnyard manure 25005000kg per mu, cake fertilizer 100kg and phosphate fertilizer 50kg as base fertilizer, fertile land can also be applied less. After application, ploughing should be carried out at a depth of more than 1 foot. After turning, the soil should be fully weathered, and then ploughed again. It is necessary to deeply plough the fine rake and make the fertility of the upper and lower soil layer uniform, so as to prevent too many roots due to the excessive fertilizer of the topsoil, affecting the yield and quality.

2. Make a border.

After leveling and raking fine, make the border, the height of the border is 15ml 20cm, the width of the border is 1m, the surface of the border should be flat to facilitate irrigation and drainage, and the topsoil should be flat and fine to facilitate the emergence of seedlings.

3. Sow seeds.

The fresh roots harvested in the same year were selected as seeds with slender roots, small Reed head, no root, fine white skin and strong Angelica dahurica. the seed amount was 1 Mu and 1.5 kg per mu. Hebei sowed seeds between the End of Heat and White Dew. There are three sowing methods: strip sowing, hole sowing and sowing. Strip sowing with a row spacing of 25ml / 30cm and a shallow trench (about 4m / 5min deep), sow the seeds evenly into the ditch and cover a thin layer of fine soil.

4. Management.

The main results are as follows: (1) the seedlings of Angelica dahurica dahur 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.

(2) fixed seedling. 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.

(3) ploughing. It should be combined with inter-seedling and fixed seedling at the same time.

(4) 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.

(5) 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 if there is no rain in the future, it should be watered every few days to keep the border surface moist before the seedlings are unearthed, so as to facilitate the emergence of seedlings; the seedlings should also be kept moist at the seedling stage to prevent the emergence of yellow leaves and produce more lateral roots; the seedlings should be watered once before overwintering. 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.

(6) remove the bolting seedlings. 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.

(7) Disease and pest control. 1 ∶ 1 ∶ 100 Bordeaux liquid was sprayed 1-2 times to control leaf spot blight. Spray 90% crystal trichlorfon 1000 times or 40% dimethoate 2000 times to kill yellow-winged fennel borer, yellow Phoenix butterfly, aphids and red spiders.