Cultivation techniques of Rhizoma Corydalis

Selection of species:

There are big leaf Yuanhu and small leaf Yuanhu, big leaf Yuanhu is advantageous to close planting, the yield is high, while the small leaf Yuanhu tuber is high grade, but the yield is slightly lower.

Land selection and expropriation:

The root of Rhizoma Corydalis grows shallowly and is concentrated in the topsoil 5~20cm, so it requires loose soil, sufficient sunshine, high dryness and good drainage, loose and humus-rich sandy loam and alluvial soil, heavy clay or sandy land is not suitable for cultivation, avoid continuous cropping. Soil pH is neutral, slightly acidic or slightly alkaline. After the previous harvest, ploughing and soil preparation in time, deep ploughing 20~25cm, fine ploughing and harrowing, so that the surface soil layer is loose. Generally make border width 100~110cm, furrow width 40cm.

Reproduction and breeding

Planting period should be based on local climatic conditions, early rather than late, early planting first root and then sprouting, which is beneficial to plant growth and development. The roots of late planting were thin and short, the number of roots was small, the growth of seedlings was weak, and the yield decreased. According to the climatic conditions of Zhejiang, the planting time should be from early September to mid-October. In production, the newly born tubers were selected, and the mother and son were removed. The tubers without diseases and insect pests and neat body surface were propagated, and the medium tubers of 1.2~1.6cm were better for planting. Generally, drainage is carried out before rice harvest in the late season, and sowing in time in mid-October. Strip sowing, 18~22cm trenching, ditch depth 6~7cm are often used, and then two rows are discharged alternately according to plant spacing 8~10cm in the sowing ditch, bud up, planting while covering soil, soil depth 6~8cm. A small amount of farm manure can also be applied in the ditch.

Field management:

The root of Rhizoma Corydalis is fond of fertilizer, and the growing season is short, so the application of sufficient base fertilizer is the key to increase yield. Sprinkling fully rotten pig manure on the ground before soil preparation, about 45000kg per hectare, ploughing deep 15cm, raking flat, and reasonable fertilization are very important for the yield increase of Yuanhu. In the case of sufficient base fertilizer, winter fertilizer (the Winter Solstice ~ Greater Cold) should be heavily applied, seedling fertilizer should be applied lightly, and winter fertilizer should be ploughed and weeded in the first and middle of December, mainly farm manure. Rain Water in the seedling stage, high humidity, pay attention to drainage to reduce humidity, so that there is no water left in the ditch, otherwise it is easy to cause rotten roots to reduce production. Specific fertilization should be grasped: it should be watered before freezing to protect it over the winter, and before sprouting in spring. Yuanhu Xifei, in addition to applying sufficient base fertilizer, should also be topdressing in time. When the spring bud seedlings were unearthed, human feces and urine were applied, 2250~4500kg per hectare, 3-5 times to water. Or 300kg the water with ammonium sulfate. Apply it again when it blossoms. Topdressing should be appropriate, too much nitrogen fertilizer, will cause overgrowth, high concentration is also easy to burn seedlings, should be repeated and small amounts.

Yuanhu likes to be moist and afraid of stagnant water, so we should always pay attention to keeping the soil moist without stagnant water. After each topdressing, the fertilizer should be properly watered to decompose the fertilizer so that it can be easily absorbed by plants. The shallow root crops of Rhizoma Corydalis are not suitable for ploughing and loosening the soil, but can only be pulled out, and the times of pulling weeds can be determined according to the situation of weeds. According to the principle that there are no weeds in the field, the grass is generally pulled out before topdressing to improve fertilizer efficiency.