1, select improved varieties, and virus-free seed potatoes. Early-maturing varieties such as Holland 15, Luyin 1, Holland 7, etc. Breeding excellent varieties with early tuber setting, rapid tuber expansion, short dormancy period, high yield, high quality and disease resistance, and breeding excellent varieties of Jieduke 2 and Keke 3.

2, cut into pieces to accelerate germination and ensure the whole seedling. Cut into pieces to accelerate germination, and each mu needs about seed potato 150 kg. 20 ~ 25 days before sowing, put the seed potato in a warm and sunny place for 2 ~ 3 days, remove the diseased potato and rotten potato at the same time, and then cut into pieces. When cutting into pieces, make full use of the advantages of the top, obliquely cut to the top in a spiral way, and finally divide it into two or four parts according to the terminal buds. Each seed potato has 1 ~ 2 bud eyes and weighs 25 ~ 30 grams. After the blade is dried, it is placed in the room of 18 ~ 20℃ and germinated by stratification. When the buds grow to about 2 cm, dry them in scattered light and plant them after greening and thickening.

3. Sow in time with double film mulching. In Shandong Province, planting in single ridge and double rows is usually carried out in a large arch shed in the sunny morning from late/kloc-0 to early February. Using large arch shed with small arch shed can be put on the market earlier. Ridge spacing is 80 cm, planting two rows, plant spacing is 25 ~ 30 cm, and planting 5500 ~ 6000 plants per mu. When planting, the ditching depth is 8 ~ 10 cm and the width is 20 cm. Applying seed fertilizer and chemicals for preventing and controlling underground pests, mixing with soil, watering, planting obliquely, first covering buds with a small amount of fine soil, then covering soil to form ridges with a height of about 15cm, flattening the ridge surface, spraying herbicides, and covering with plastic film with a width of 90cm.

4. After fertilization is completed, turn over the ground and water it, so that fertilizer and soil can be mixed together to increase soil fertility. After mixing, plant the land evenly, and then let the sun shine for three to five days before sowing. It should be noted that you should not choose rainy weather for sowing, because there is no sunshine in rainy weather, which is not conducive to the development and growth of seeds. Rain may break seedlings and reduce the survival rate.