First, choose a good field, timely sowing. Select double-cropping rice areas with an altitude less than 100 meters, less frost or no frost in winter, and an average annual temperature of 19 degrees C or above, and require deep plowed layers, loose texture, superior mid-range fertility, and convenient paddy fields; The double late rice was sun-dried white immediately after harvest in mid-November, sowed in mid-December and harvested from late March to early April of the following year. Second, fine soil preparation, deep trenches. In winter, potato in the paddy field is most afraid of water accumulation, and fine soil preparation should be promoted. The cultivation of sorghum should be deep-seated. Before planting, the sorghum should be smashed and leveled, the piles should be cleaned, and the sorghum should be built in deep trenches. The sorghum should be 35-40 cm high and 90-100 cm wide. Grooves 30-40 cm. Third, select good varieties, reasonable dense planting. Winter potato should use early and mid-maturing varieties, such as Chunshu 4, Zhongshu 3, Kexin 3, Chunshu 2 and Kexin 2, and so on. In order to increase the yield, it is better to use virus-free seed potatoes. The use of double-line sowing, plant spacing 30 cm 30 cm, sowing a potato per hole, acres broadcast 3000-4000 points. Fourth, the whole potato sowing, see germination. The disease-free whole sweet potato was soaked with 10 ppm gibberellic acid 15-20 days before sowing for 15 minutes and then germinated in wet sand; or sprayed with 5 ppm gibberellin and 1% thiourea mixture. It can also germinate under the scattered light of room temperature 15-18°C about 40 days before sowing, and remove the rotten, diseased potato and long-sizing tuber at any time, until the tuber bud is about 1cm long, and the bud base appears white. Root can be sown. Fifth, pay attention to basal fertilizer and apply fertilizer early. In winter, fertilization should be based on basal fertilizer, supplemented by topdressing; early application of topdressing should be done with more manure and nitrogen fertilizer should be applied. The basal manure urine 1000 kilograms plus superphosphate 20 kilograms, potassium sulphate 15 kilograms, or 50 kilograms per mu with ternary compound fertilizer, can be planted under cover soil, and 1500 kilograms of soil miscellaneous fertilizer is used as cover seed fertilizer. Repeat 2 cm of soil. In the seedling stage, combined with seedlings, seedlings, weeding, weeding and weeding, the first topdressing is performed with 1,000 kg of human excreta and 15 kg of urea per mu. 30 days after emergence, the second top dressing was applied and 1,000 kg of acquainted human excrement was applied. Sixth, timely cultivation, thick soil training. During potato growing period, combined with top-dressing, timely cultivating, weeding and earth-cultivation were carried out twice, the first time in the seedling stage, and the second time in planting ridges combined with top-dressing, deep ditch and thick soil to reduce deformed tubers and prevent late blight. Before winter frost, cover rice straw or straw 2-3 cm insulation and frost protection. Seven, scientific water pipes, pest control. In early droughts, irrigation should be performed in time, drainage should be paid attention in the later period, and the soil should be kept moist throughout the growing season. The main diseases of the potato should be controlled in time.
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