Techniques of cultivating Houttuynia cordata Thunb in Field

1. Select the seed stem. Houttuynia cordata Thunb is propagated without seeds, and the rhizome is chosen as the seedling. Should choose the stem in the non-flowering plant that is stout and enlarged, the Internode length is long, and the root damage is less. The stem length is at least 5 to 6 cm, preferably 15 to 20 cm. It can be planted all the year round. However, in order to ensure the survival rate, it is best to choose in spring, when the stem has just sprouted, transplanting is easy to survive.

2. Land preparation and bottom fertilizer. Choose a field with convenient irrigation and make a border bed after comprehensive soil preparation. And basic fertilizer should be applied during soil preparation, and 3000 to 5000 kg of farm fertilizer, 50 kg of compound fertilizer, 50 kg of superphosphate, 15 to 20 kg of potash or 100kg of plant ash should be applied per mu.

3. Trench and sow seeds. In the border bed in the field, a longitudinal trench is opened every 35 centimeters, with a depth of 8 to 10 centimeters, and a stem of houttuynia cordata is planted every 7 to 10 centimeters in the ditch. After setting it up, cover the planting stem carefully with fine soil, so that the seed stem can not be exposed to the soil surface.

4. Weeding and irrigation. Houttuynia cordata is easily squeezed out by weeds, so after sowing, glyphosate and Acetochlor should be sprayed in the field immediately, and Acetochlor every 20 days thereafter. After Houttuynia cordata covered the whole field, the weeds were pulled out by hand. Houttuynia cordata like wet but afraid of flooding, irrigation is best furrow irrigation and sprinkler irrigation, not flood irrigation, to ensure that there is no water on the bed surface of the border bed and there is stagnant water in the bed ditch.

5. Fertilization management. After sowing, starting from Changqi seedlings, fertilizer is applied every 10 to 15 days, and 30% of people's feces are applied each time. 50% of human manure is applied during the peak growing season from May to June. 1500 to 2000 kilograms per mu, and about 10 kilograms of urea per mu for the last time. After the closure of Houttuynia cordata Thunb, there is no longer topdressing between rows, but foliar topdressing can be carried out, spraying with 0.1% to 0.2% potassium dihydrogen phosphate, about 50 kg of water and fertilizer mixture per mu. When Houttuynia cordata Thunb grows up, the buds should be removed in time in order to use nutrients on the growth of underground stems.

6. Harvest. The leaves and stems of Houttuynia cordata Thunb are edible, but it is not suitable to pick leaves in the first year of planting, and tender leaves and underground stems can be collected from February to April in the second year. May and June is the peak growing season of Houttuynia cordata, so it is not suitable to be harvested. Tender leaves can be picked from July to September, and underground stems can be picked from September of that year to March and April of the following year.

7. Disease control. Houttuynia cordata is generally free from insect pests. The common diseases are white silk disease, root rot, purple spot, leaf spot and so on. In general, diseases are rare in 1 to 2 years, and the above diseases will appear one after another from the third year. The diseased plants should be dug up in time, and the acupoints should be disinfected with pentachloronitrobenzene, and then sprayed in the field with 1 ∶ 1 ∶ 100 Bordeaux solution or 25% trimethoprim 1000-fold solution, or with 50% topiramine and 50% acetaminophen 250-300 times solution.