The sweet potato, which is known as the "top vegetable," has been recognized by more and more people because of its high food and health care value. Its consumption has grown rapidly and prices have skyrocketed. In many parts of China's capital cities such as Beijing, Tianjin, Hebei, Shandong, and Henan, the price of ordinary fresh potatoes has increased from 0.5-0.8 yuan per kilogram in previous years to 4-5 yuan; 8-12 yuan per kilogram, reached the level of pork prices. Therefore, the production of sweet potato that has been left for many years has received much attention in many places and it has become a project for farmers to increase their wealth. For this reason, the author has been receiving telephone calls from some farmers' friends for sweet potato production.
Sweet potato should be high quality and high yield, and selection of good seed is the key. Spring potatoes in northern China are grown in thin hills. We should choose high-yield and high-quality varieties that are drought-tolerant, thin-tolerant and have a long growing period. Such as Jinshu 21, Xushu 43-14, Jishu 15, Yushu 13th, Yushu 12, Haoshu 6-8, Yantai 22 and other varieties. The purple sweet potato's nutrition and health care function is significantly higher than that of ordinary sweet potato, but the output is slightly lower than that of common sweet potato, and the conditions are available from Jinshu No. 18, Caizi, Jingshu No. 6, Violet, U.S. black potato, etc. Potato varieties used in local conditions. In order to increase the yield of sweet potatoes, it is necessary to purchase the seedlings correctly. Spring potato is best to use virus-free high-cut seedlings: one hundred seedlings weighing more than 500 grams, seedling height 20-25 centimeters, between 5-7 single plants, stout stalks, top three leaves flush, leaves green, large and hypertrophy , no pests and strong seedlings. High-cutting seedlings can not only prevent seedlings from damaging seed potatoes and affect the growth of other seedlings, but also greatly reduce virus disease, black spot disease, and nematode disease. Planting high-cutting seedlings generally increases yield by more than 10% than planting rooted shoots. In the summer, the seedlings were planted and the mandibles of the secondary seedlings in Daejeon were used to produce the highest yield in the top section, followed by the middle section and the worst in the base section. According to tests, the top section increased production by 17.2% over the middle section and increased by 20.3% over the base section. This is because the top segment of the cell tissue activity is high, strong growth potential, is conducive to the formation of potato blocks, and the more the degree of lignification of cell tissue to the base, the greater the vitality of life is not conducive to the formation of potato block.
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