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First, choose the base fertilizer Shitian choose to meet the pollution-free production requirements of the field. After the harvest of the former crop, deep plowing 2 times, before the last ploughing, apply the base fertilizer, apply 250,000-3000 kilograms of manure fertilizer or manure per acre, turn it into the soil and put it into the soil, put 3-5 cm depth of shallow water After the release of water, 3000-4000 kg of green manure will be applied per acre. After the green manure is rotted, the soil will be cultivated. Second, the selection of seedlings to choose the ripening period suitable Eilian 4, and so on. Select planting pods, no pests and diseases, thicker rear section, characteristics of this variety, complete two or more sections, single pods weighing over 250 grams, and pods and pods that are not broken. Third, the appropriate period of general planting in mid-April the temperature is stable above 15 °C planting. The cultivation of medium and late-maturing varieties is relatively dilute. The general spacing is 2-2.5 meters, and the distance between holes is 1-1.5 meters. Each 270-400 holes are planted with 150-200 kilograms of seedlings. Early maturing varieties use 1.5-2 meter spacing, 1-1.5 meter spacing, 300-450 holes per acre, 1 seedling or 2 seedlings planted per hole, and 200-250 kilograms of seedlings. Planting holes must be staggered and the top buds should be directed toward the field. After the emergence of combined fertilizer, remove the dead leaves, weeding once every 20-30 days, until the vertical leaf seal only. Fourth, the water layer management to maintain the early stage of growth 5-10 cm deep shallow water until the increase of the temporal leaves gradually deepened, to the vertical leaves reached the water depth of about 20 cm. At the beginning of the scab, the water level will be reduced to about 10 cm deep within 3-5 days. By the time new crops mature, the water level should gradually drop to 3.5 cm deep. 5. Fertilizer by phases When there are a few leaves in the field that stand out of the water, 20 kg of urea is applied per mu; when the leaves are covered in whole fields, 30 kg of compound fertilizer is applied per mu. Top dressing should be applied after the dew is completely dry. Before application, dry or shallow field water should be placed. After spraying, rinse the leaves to prevent chemical fertilizers from burning. Apply water 1 day after application. 6. When the tip of the main stem or branch extends to the edge of the field, from the unrolled direction of the leaf wrapping, reach out to the soil under the soil and gently pull out the tip, turn the tip to the field and cover the mud. The tip should be carried out in the afternoon, because the head of the morning is crisp and easy to break. VII. Diseases and pests prevention The main diseases are lotus root rot disease and brown spot disease. The local diseased strains of lotus root rot should be extirpated immediately and treated with 50% carbendazim or 70% thiophanate-methyl wettable powder. Pounding of heavy fields must be repeated at 4 years intervals. In the early stage of brown spot disease, 50% carbendazim 600 times spray was used for prevention and treatment. At the same time, less nitrogen fertilizer was applied, and phosphorus, potassium and calcium fertilizers were added. The main insect pests are lotus root food insects (grasshoppers), lotus root tube borers and so on. Can use 50% phoxim EC 50-100 grams mixed with 3-4 kg poison Valley, spread evenly, and then plough the field, so that pesticides mixed with soil poisoning to kill the earthworm; with 2000 times Koji powder pyrotechnics lotus root tube control. VIII. Harvesting Mid-August, according to the market conditions, Nenqu will be listed on a continuous basis.