1

Choose neutral or alkaline plots with loose soil and good irrigation and drainage. The ridge is about 30cm high and 140cm wide. According to the plant spacing of 25-35cm, the trench is dug obliquely downward along the slope, with the trench length 100cm, the trench top depth of about 5cm, the trench bottom depth of about 20cm, and the trench width 15cm. The trench surface and the horizontal plane of the ridge bottom form an inclination angle of15-30, and the directional trench is buried along the trench direction.

Variety selection and seed potato treatment of No.2

Choose high-yield, high-quality and disease-resistant yam varieties such as Quyu 1, Wenshanyao 1 and Yuzihu Aishan. Cut the seed potato into pieces about 5cm long, soak the seed potato10-15 min with 500-600 times of 50% carbendazim wettable powder, then pick it up and dry it, and then smear the wound with quicklime and talcum powder to heal it. Or seed dressing with mancozeb powder and air drying.

No.3 accelerating germination and sowing

Spread the sterilized and wound-healed seed potato blocks evenly on the sunny seedbed, cover with 5- 10cm fine sand, and build a small arch shed to accelerate germination. Seeding the germinated seed potato in a directional soil covering tank, with the seed potato block 5cm away from the top of the tank, and then covering the seed potato with broken soil about 10- 15cm.

The fourth site management

When the weather is dry, use drip irrigation facilities to replenish water in time to keep the soil moist and loose. Check regularly after emergence, and replant the seedlings in time if they are found missing. If it is found that there are too many seedlings per plant, remove the weak seedlings and keep the 1-2 strong seedlings. When the height of the seedlings is about 30cm, put a herringbone shelf with bamboo and pull the stems and vines onto the shelf.

5. Prevention and control of diseases, pests and weeds

From the beginning of seed selection, we should pay attention to the prevention and treatment of viral diseases, anthrax, nematodiasis and other diseases; Control pests such as cutworms and Spodoptera litura.

6 harvesting and preservation

For indoor storage, the temperature is controlled at 15- 18℃, the relative humidity is 70-80%, and ventilation is maintained; When storing in a cellar, the temperature in the cellar should be kept at 10- 15℃, and the cellar should be disinfected before storage, and ventilated and dehumidified during storage; Production plots should be stored in situ, deep drainage ditches should be opened, the drainage should be smooth and the ridge surface should be dry, and the shelves should be dismantled while mining.