The benefit of planting potato in winter idle field is good.

1. Select the field and sow it at the right time. Double-cropping rice areas below 100 meters above sea level, with little or no frost in winter and an annual average temperature of more than 19℃ shall be selected. Rice fields with deep tillage layer, loose texture, middle-class fertility and convenient irrigation and drainage shall be selected; meanwhile, sowing time shall be reasonably arranged. Double-late rice shall be deeply turned and sun-bleached immediately after harvest in mid-November, sown in early and middle December, and harvested from late March to early April of the next year.

Second, fine soil preparation, deep ditch and high ridge. Winter potato planting in paddy field is most afraid of ponding, so fine soil preparation, deep ploughing and high ridge cultivation should be advocated. Before planting, harrow and level, clean rice piles, open deep grooves and build high ridges, with ridge height of 35-40 cm, width of 90-100 cm and furrow of 30-40 cm.

Third, select fine varieties and plant them reasonably. Winter potato varieties should be selected early and medium maturity varieties, such as Chunshu No.4, Zhongshu No.3, Kexin No.3, Chunshu No.2, Kexin No.2, etc. In order to improve yield, it is best to select virus-free seed potatoes, adopt double-row hole sowing, plant spacing 30cm × 30cm, sow one seed potato per hole, sow 3000-4000 holes per mu.

Fourth, the whole potato sowing, see seed germination. selecting disease-free whole tubers, soaking the tubers in 10ppm gibberellin solution for 15 minutes 15-20 days before sowing, and then putting the tubers in wet sand for germination; or spraying the mixture of 5ppm gibberellin and 1% thiourea for germination; or putting the seed tubers under scattered light at room temperature of 15-18 DEG C about 40 days before sowing for germination, and removing rotten, diseased tubers and tubers with long fine buds at any time, and sowing when the tubers are about 1cm long and white root points appear at the bud base.

Fifth, pay attention to base fertilizer, early application of topdressing. Winter fertilization should be based on base fertilizer, supplemented by topdressing; early topdressing, more farm manure, appropriate nitrogen fertilizer. The base fertilizer is 1000 kg of human manure per mu plus 20 kg of calcium superphosphate and 15 kg of potassium sulfate, or 50 kg of ternary compound fertilizer per mu. After covering the soil, the potato seeds can be planted, and 1500 kg of soil miscellaneous fertilizer per mu is used as cover seed fertilizer, and the top is covered with 2 cm soil layer. In the seedling stage, the first topdressing is carried out in combination with seedling inspection, seedling supplement and intertillage weeding, and 1000 kg of human excrement and 15 kg of urea are used per mu. 30 days after emergence, the second topdressing is carried out, and 1000 kg decomposed human excrement is applied per mu.

VI. Cultivate the soil in time. During potato growing period, combine topdressing with weeding and cultivating twice in time, the first time is in full seedling stage, and the second time is combined with topdressing, clearing furrow and thick cultivating before plant ridge sealing, so as to reduce abnormal tubers and prevent late blight. In winter, before frost, cover straw or straw 2-3 cm to keep warm and freeze.

7. Scientific water pipes to prevent diseases and insect pests. Irrigation should be timely in early drought, drainage should be paid attention to in late stage, soil moisture should be kept during the whole growth period, and main potato diseases should be prevented and controlled in time.