Land selection and preparation of Angelica sinensis

The main results are as follows: 1. According to the growth habits of Angelica sinensis seedlings, we choose the land surrounded by mountains, loose, fertile soil, high humus content, leeward, short light time, cool and moist land to raise seedlings. Angelica sinensis seeds are small, bud top soil strength is weak, so it is necessary to fine soil preparation in order to ensure normal seedling emergence. Ploughing the soil in the first year to make the soil fully weathered, it is best to turn the soil three times from April to May of that year. The first and second turning depth is 24030 cm, the third shallow turning is 915cm, drying and burning the weeds, turning them into the soil, sorting out the gravel and unburned weeds, smashing the bumps, leveling the ground, and then applying 5000 kilograms of farm manure per mu as base fertilizer. Then smooth the mountain to make a border, with a width of 100 cm to 120 cm and a height of about 25 cm. A drainage ditch is opened around to facilitate drainage, with a width of 18 cm and a depth of 15 cm. When seedlings are raised under this condition, the plants grow thickly, close each other, the leaves grow upward, the sugar accumulated by photosynthesis is less, but the nitrogen absorbed from the soil is more, and the bolting and flowering rate is low. If we choose a place with sufficient sunshine and dry and barren soil to raise seedlings, even if we apply enough manure and fine soil preparation, but because of strong sunlight, less dry soil emergence, flat spread of leaves, large plant nutrition area, high sugar accumulated by photosynthesis, and dry soil, the bolting and flowering rate increases with less nitrogen absorbed from the soil, which should be paid great attention to.

2. Planting (transplanting) land

Angelica sinensis is a deep-rooted crop, deep in the soil, like fertilizer, afraid of stagnant water, avoid continuous cropping. The transplanting site should choose the mature land with deep soil layer, loose and fertile soil, high humus content and good drainage. After the previous crop harvest, the soil should be ploughed in time to make the soil weathered. The newly reclaimed wasteland should plant crops for a year before planting Angelica sinensis. Double rake twice before planting, applying rotten barnyard manure 4000kg / mu, oil residue 100kg, ammonium molybdate 0.2 kg, manganese sulfate 2kg per mu. If there are conditions, it should be irrigated in winter and raked again in the spring of the following year. After turning and raking fine, the slope is made into a high border with a height of 30 cm, a width of 1.5 cm, a width of 1.5 cm and a distance of 30 cm or a ridge with a width of 40 cm and a height of 25 cm.

The second year of Angelica sinensis growth requires higher temperature and sufficient light than the seedling stage, and the sunny slope is better than the shady slope. Angelica sinensis is not suitable for continuous cropping, and the previous crop is suitable for continuous cropping, such as rape, corn, tobacco, green manure, etc., but not for rotation with potatoes and beans. If continuous cropping is necessary, more organic fertilizer must be applied and topdressing must be done, and soil treatment should be done with fungicides and pesticides.