Excuse me, when and how to grow sweet potatoes in the north?

1. Breeding began in the north, sowing after Qingming, and harvesting at the first frost.

2. Seedling raising: The seedling raising time should be earlier than mid-February. Choose deep and fertile soil with sunny and leeward soil layers, and move the seed potatoes into the protected field for seedling raising. The seedbed is protected by double-layer film, and the seed potatoes are arranged neatly, covered with a layer of rare earth, covered with a layer of plastic film, and arched with a layer of film to improve the ground temperature of the seedbed. Punch holes in the flat plastic film to guide seedlings in time to avoid burning seedlings in sunny days and high temperatures.

3, fertilization: full fertilization to ensure nutrients. Apply about 2-3 tons of farmyard manure, 0/5 kg of urea/kloc and 20 kg of phosphate fertilizer per 100 mu.

4. Plastic film mulching: Plastic film mulching can increase temperature and moisture, improve soil physical and chemical properties, and increase the temperature difference between day and night. Sweet potato planting generally adopts high ridge mulching and two-way staggered planting. The total distance is 60cm, the coverage area is 50cm, the row spacing is 40cm, the plants are staggered, the plant spacing is 33cm, and there are about 4000 plants per mu. The height of the ridge is moderate. If the planting period is too dry, flat cover and flat planting can be used.

5, timely early planting: timely early planting, reasonable close planting. Mid-April is the suitable period for transplanting seedlings. At this time, the temperature rises in early spring and is basically stable throughout the year. The suitable time for sowing seedlings is 10cm after the end of late frost, and sowing can be carried out when the ground temperature reaches 15 degrees. Last winter or the beginning of the year, I plowed and sunned early, and cleared the ridges and ridges again when planting.

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