Japanese yellow potatoes and black potatoes are new sweet potato varieties introduced in recent years. Japanese yellow potatoes, yellow skin, deep orange, dark skin, smooth skin, very beautiful, sweet taste and sand taste, good taste, thin skin, cooked skin easily separated. Japanese black potatoes, purple nearly black, bright and beautiful, bright red and purple flesh, more beautiful than the "heart of the United States" radish color, cooked purple, taste good, rich in selenium, iodine, nutrition is superior to other sweet potato varieties. These two varieties are very popular among urban and rural residents and hotels, and the market price and seed price are high. In order to introduce a small number of species of potatoes and produce more varieties of seedlings, the techniques for rapid propagation of single leaf sections are described below. There is one axillary bud and two root primordiums on each leaf segment of sweetpotato vine. Under suitable environmental conditions, 1 mus sweet potato seedlings are propagated using the single-leaf section of sweet potato, and only 2 to 3 kilograms of seed potatoes are needed. . 1. Beds with high dryness, fertile soil, loose texture, and convenient drainage are selected as beds. The bed is 1.3 meters wide and the length is not limited. It is better to use north-south direction. For every 0.1 mu bed, 250 kg of composted soil, 5 kg of ammonium bicarbonate, and 10 kg of phosphate fertilizer are ploughed. After the ploughing is completed, the dam is built around the seedbed to facilitate watering and fertilization. 2. Immerse the seeds and soak the seed potatoes in 50% carbendazim powder 300 times for 5-8 minutes, remove and dry, and go to bed. 3. Seedlings are usually planted in early March. When the seedlings are discharged, they must be sorted and discharged separately. The seed heads are heading north, about 2 cm above the bed. After the water is drained, a layer of fine soil is placed on it, then the bed surface is covered with a plastic film and an arched plastic film is added. Double film coverage can be heat preservation and moisturizing. 4. When the young seedlings are cut to about 20 cm, they can be cut. To use thick seedlings, cut each leaf section. Leave 0.8 cm above the leaf section and 3 cm below the leaf section. For short and thin vines, they can stay on the seedbed to continue growing. The seedlings on the day of cutting the seedlings should not be topdressed with water, so as not to affect the wound healing. Two to three days after the seedlings are cut, 25 grams of urea are forced into the bed and water is poured into the bed, and then the cover film is warmed to promote the growth of the next batch of seedlings. 5. Nursery to cut to do with the cut with the plug, leaf section into the soil about 0.7 cm, spacing 15 cm, spacing 3-4 cm, after planting water permeable, and then scaffolding cover film. 6. The management of sweet potato single-leaf section after nursery is long after the first long root seedlings, 7 to 10 days after planting, to prevent the nursery bed temperature is too high to burn seedlings, nursery bed should always maintain a certain humidity, long seedling stage bed temperature To control at 25 °C or so. Ten days after planting, new roots began to emerge, and after 10 days, axillary buds began to grow. At this time, small fertilizer should be used to apply a seedling. When the height of the seedlings is about 18 cm, the second single-foliage seedlings are planted according to the law.
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