1. Deep tillage and ridge
Planting sweet potatoes requires deep and loose soil layers. It is good to plough the farmer's fertilizer, and the farmer's fertilizer is 2800-3000. Ridge cultivation can deepen the tillage to promote root development and expansion of potato tubers. The method is to first open the ditch and apply the farmer's fertilizer to cover the soil and ridge. The height of the ridge is 27 cm wide and 60-70 cm. The fertilizer is wrapped in the ridge and then the hoe is used to open one row or two rows of 10 cm shallow ditch in the ridge. Lay flat, the root is slightly bent into the soil and compacted by hand. When the bottom is insufficient, it should be watered.
2, early planting shallow sowing, reasonable close planting
Early planting can make full use of the growing season to increase production. When the spring potato is stable at 5 °C above 5 °C, it can be cut, and the summer potato is mostly broadcasted after the wheat harvest. The cutting depth is generally 5-7 cm. The cutting density is 3500-4000 plants per mu of spring potato and 5000-6000 plants of summer potato, and the varieties of short potato can be increased appropriately.
3. Strengthen field management and appropriate measures
(1) Checking seedlings and replenishing seedlings: Seedlings often suffer from lack of seedlings due to the harm of tigers in the ground. It is necessary to infiltrate or manually capture the poisonous bait of grass. When the seedlings are replenished, water is added to ensure the whole seedlings.
(2) cultivating and cultivating early promotion: timely cultivating and cultivating after slow seedling, and raising the ground temperature to promote early development. Be careful not to loosen the root soil.
(3) Appropriate amount of topdressing and irrigating irrigation: It is proved that the potato seedlings can be lightly applied after the survival of the potato seedlings, especially in the potato-soil stage, the potato roots begin to expand, and the fertilizer-reducing power is large, and the potassium fertilizer can be applied to the ridge. Generally, it is combined with cultivating and weeding in the end of July to early August, and it should be considered as good in combination with foliar spray in the middle and late August. Or in the cracks, the ground is watered with 250-500 kg of decomposed manure. Sweet potato is a drought-tolerant crop, but in the period of growth of stems and leaves, if there is a dry weather, small water can be lightly irrigated. In the later stage, the soil moisture should not be too large. If there is even rainy weather, you should pay attention to draining water to prevent water accumulation in the field.
(4) Lifting the heart and leaf spray to prevent the stems and leaves from being long: In the past, most people thought that turning the vines could reduce the roots of the vines and prevent them from growing. Experiments have shown that the method of turning vines can cause a reduction in production. The method of "lifting vines" should be carried out during the La Mang period, and the vines are still returned to the original place. The method of topping is to remove the 1-3 cm part of the top of the seed when the vine grows to 30-50 cm, and control the extension of the vine to promote the expansion of the tuber. In addition, the sweet potato leaf spray paclobutrazol can inhibit the growth of stems and leaves to promote the expansion of potato tubers. During the period of La Mang, 50 g of paclobutrazol was applied to 50 kg of water for foliar application, but if it was exposed to water (within 24 hours), it was necessary to re-spray.
(5) The cultivating and digging trenches promotes the expansion of potato tubers: This is applicable during the sweet potato expansion period. The cultivating and weeding trenches can be used to reduce the moisture and nutrients.
4, timely harvest, safe storage
The sweet potato harvest time should be cut before the frost and then digging. Pay attention to light, light, and light to prevent damage. Finally, the sweet potato pieces, which are harmless, disease-free and not frozen, are piled up in the potato stalks to strengthen the management of the sputum, especially the temperature management.
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