1. Select a site to build a shed: Choose sandy loam soil with convenient drainage and irrigation and moderate fertility, and build a steel pipe greenhouse with a height of 2m, a length of 30-40m, and a width of 6.5m. The direction is to sit. North faces south. 2. Breeding seedlings: First cut the rhizome to 8-10cm long (with more than 2-3 axillary buds), then place it in the ditch and cover it with 6-10cm of soil to keep the seedbed moist. 3. Sorghum cultivation: Make 4 borders and open sowing furrows with a width of 15cm and a spacing of 20cm on the borders.

1. Selecting a site to build a shed

1. Selecting a site

Houttuynia cordata (Houttuynia cordata) is suitable for planting in areas with flat terrain, sufficient water sources, and convenient drainage and irrigation. In sandy loam soil with deep tillage layer, suitable soil structure, good physical and chemical properties and moderate fertility.

2. Building a shed

Generally, a steel pipe greenhouse can be built facing north and south. The greenhouse is generally 2m high, 30-40m long, and 6.5m wide.

2. Breeding seedlings

1. In April-May, the rhizome of the wild Fructus rhizome can be cut to 8-10cm long. For small segments with more than 2-3 axillary buds, fibrous roots need to be left.

2. Then open a shallow trench with a depth of 5-8cm in the seedbed according to a row spacing of 20-25cm, and place the cut rhizomes in the trench according to a plant-to-plant spacing of 8-10cm.

3. Then cover with 6-10cm of soil and shade in time to keep the seedbed moist. Generally, the seedlings will emerge in 15-20 days.

3. Sorghum cultivation

1. According to the direction of the greenhouse, four 10m long, 20-25cm high and 1.2m wide can be made in the greenhouse. , the border is 40cm apart.

2. Then open four sowing furrows 15cm wide, 20cm apart and 10-15cm deep on the border.

4. Land preparation and fertilization

1. Fine soil preparation

(1) Remove weeds and roots of previous crops from the soil And dead leaves are completely removed, and then deeply plowed and sun-dried, the depth is generally 25-30cm.

(2) When sowing, the plot should be plowed deeply and leveled to make it loose and flat.

2. Apply sufficient base fertilizer

(1) Generally, 5000-8000kg of decomposed cow dung, chicken manure and other farmyard manure, 150-200kg of plant ash, and phosphorus are required for every 667 square meters. Potassium compound fertilizer 100-150kg.

(2) After mixing the decomposed organic fertilizer and phosphorus-potassium compound fertilizer, it can be applied directly into the sowing ditch and covered with soil with a thickness of 2-3cm. After leveling it, sowing can be done.

5. Sowing

1. Select seed stems

It is advisable to choose stems with 1-2 bud eyes, strong and uninfected. Damaged old underground stems are used as seed stems.

2. Sowing method

(1) Generally, it can be sown evenly in the sowing furrow at the beginning of September at a seeding rate of 40-50kg per 667 square meters.

(2) Note: The bottom water needs to be poured thoroughly, and then the seed stems should be covered with soil with a thickness of 6-7cm.

6. Field management

1. Control temperature

(1) Generally, the shed can be closed at the end of October, before budding. , can keep the temperature during the day at 18-20℃ and the temperature at night at 16-18℃.

(2) When 80-85% of the buds are unearthed, the temperature can be maintained at 20-25°C and ventilated in time to avoid excessive growth.

(3) In January of the following year, an arch shed can be built in the greenhouse and covered with cotton felt for insulation.

(4) At the end of April, the greenhouse film needs to be removed to prevent the seedlings from burning due to excessive temperature.

2. Water and fertilizer management

(1) Fertilization

① From the survival of the seedlings to the time of closure, generally every 667 square meters Topdress 8-10kg of urea as seedling fertilizer.

② During the peak growth period of stems and leaves, topdress 10-15kg of compound fertilizer per 667 square meters.

③In the future, it will be changed to external top dressing. Generally, 0.4% potassium dihydrogen phosphate solution can be used, sprayed once every 7 days, and sprayed 4-5 times.

(2) Watering

① Generally, the soil must be kept moist during the entire growth period, and contaminated dirty water cannot be watered.

② Notes: Do not apply unfermented human (animal) excrement, nitrate nitrogen and other fertilizers, and do not apply any fertilizer within 30-35 days before harvesting.

3. Remove the flower buds

(1) When the above-ground part of the root of the folded ear grows too long, the young stems and leaves need to be harvested in time.

(2) When flowering and budding appear, the flower buds need to be removed in time to prevent the flower buds from consuming a lot of nutrients and thereby inhibiting the growth of underground stems.

7. Prevention and Control of Pests and Diseases

1. Diseases

(1) White silkworm disease

①Incidence Symptoms: This disease mainly damages the rhizome of the root of the ear root close to the ground. After contracting the disease, a large amount of silky white mycelial layer will be produced on the surface of the diseased part. As the disease progresses, the white mycelial layer will turn into Brown, in the later stages it is easy to cause the entire plant to turn yellow and die.

② Prevention and control methods: Generally, 45% Tecodo suspension agent 1000 times the liquid, 10% Shigao water dispersible granules 8000 times the liquid, 50% Diprofen wettable powder 400 times the liquid and other chemicals can be sprayed Water on the rhizomes of diseased plants, as well as on adjacent plants and soil. Continuous cropping should be avoided at ordinary times. In plots with severe disease, it is advisable to rotate crops with grass crops. If conditions permit, crop rotation between floods and droughts can be implemented.

(2) Leaf spot disease

① Characteristics of the disease: In the early stage of the disease, irregular or circular lesions appear on the leaf surface, and the edges of the lesions are purple-red. The center is off-white with light gray mold on it. When the disease becomes severe, the lesions will fuse together, and sometimes there will be holes in the center of the lesions, causing part or all of the leaves to die.

② Prevention and treatment methods: In the early stage of the disease, 50% thiophanate methyl 800-1000 times liquid, 70% mancozeb 400-600 times liquid and other chemicals can be sprayed for prevention and control. Spray 1 hour every 15 days. times, spray 2-3 times continuously.

(3) Stem rot

① Characteristics of the disease: There are oval or fusiform water-soaked lesions on the stems, the color is brown to dark brown, and the edges are The color is darker and there are obvious ring patterns. When the disease is severe, the stems may easily rot and die.

②Prevention and treatment methods: Generally, in the early stage of the disease, 50% carbendazim wettable powder, 65% methanozine wettable powder 500-600 times liquid, and 70% thiophanate methyl wettable powder can be used Use 800 times liquid and other chemicals for spray control. Spray once every 7 days and spray 2-3 times continuously.

2. Pests

(1) Characteristics of the disease

Pests on the root of the ear are mainly caused by mites, including adult mites, if Mites and young mites will pierce and suck the sap on the leaves and twigs of the root of the root. Many pink-green to gray-white dots will appear on the damaged leaves, which are dull. When the disease is severe, it will cause a large number of fallen leaves and dead branches.

(2) Prevention and control methods

Generally, 24% mite hazard suspension agent 4000-6000 times liquid, 73% Gramite emulsifiable concentrate 2000-3000 times liquid, 5% Nisolan Use 3000-5000 times of emulsifiable concentrate and other chemicals for spray control.