1. Select and cultivate strong seedlings. Only by selecting good varieties can you achieve the best economic benefits. Seeds can be selected according to the purpose of production: it is better to choose varieties with high yield, good disease resistance and moderate starch content (about 18%), such as Xu Zishu No. 1, Ning Zishu No. 1, Chuanshu 73, etc., with commercial properties (edible). ), with good palatability and good commercial properties; for starch processing and feed, varieties with high yield, good disease resistance and high starch content (about 28%) should be selected, such as Xushu 18, Xicheng 007, Chuanshu 164, Nanshu 97, etc. . 2. To cultivate strong seedlings, select a sunny and fertile plot that has not been planted in the previous year, and use the method of dense planting with mulch (after the seedlings grow to about 20cm, pull out the seedlings and transplant them) or nest planting. In the process of raising seedlings, use more clear manure water to make the sweet potato seedlings dense and strong, with many milk cuts, thick leaves, moderate size, dark green color, no aerial roots on the vines, strong root bases, and no pests and diseases, which are high-yielding. laid the foundation. 2. Planting. Deep ridge cultivation creates loose soil and sufficient nutrient supply, which is the basis for the high yield of weicai. Before planting, the rows planted with sweet potatoes should be plowed deeply to loosen the entire row, so that the sweet potatoes can absorb oxygen and emit carbon dioxide in the future; then, the deep borders should be plowed, and the ridges should be higher (20~30cm) and wider (60~60cm) than the ridges. 80cm), the furrow should be narrow and the ditch should be deep, which is beneficial to drought prevention and drainage and the expansion of stubble. 2. Weicai is planted early and has no obvious growth period. As long as the temperature and humidity are sufficient, it can grow normally. It is advocated that Weiwei should be planted and fully transplanted during the awning season, which is beneficial to early growth of Weiwei. It has long vines, large photosynthetic area, large accumulation of dry matter and high yield. Practice has shown that when the temperature is above 15°C, the yield can be increased by 1% to 1.2% per day. If summer wild rice is planted early, the yield can be increased by 2.5% to 3% per day. 3. Use node tip seedlings. Promote the use of node tip seedlings, two-cut seedlings and three-cut seedlings with thick stems and short nodes. This shoot tip seedling has the advantages of a sharp tip, tender cell tissue, strong vitality, strong ability to germinate new roots, and strong ability to produce potatoes. Stem nodes with fallen petioles and yellow stems are not selected. The length of each cutting seedling must be about 25cm before it can be deeply planted. When it is planted about 10 cm in the soil, 10 cm is left outside the soil for photosynthesis, so it can survive and grow quickly. 4. Planting needs to be done in a reasonable and dense manner according to different varieties, soil fertility, sowing date, planting method, etc. Generally, there are 3,000 to 3,500 nests per acre in spring and 3,500 to 4,000 in summer. When planting, it is usually better to use horizontal planting. Each node (3 to 5 nodes) buried in the soil is planted horizontally in a shallow soil layer 3 to 5 cm below the ridge surface. All nodes can take root and grow evenly, allowing the red sweet potato to achieve high yields. How to grow red yams? High-yielding cultivation technology of Polygonum cuspidatum_. Fertilization1. Balanced fertilization can use a large amount of organic fertilizers, such as dry fertilizers, human and animal manure, etc. , can improve soil structure, increase soil microorganisms, and increase soil organic matter content; straw can also be returned to the field to ensure the organic fertilizer content in the soil. That is, after by-products such as wheat straw and rapeseed shells are buried underground, they can also loosen the soil, increase soil organic matter and nutrients, and significantly improve the shape and yield of sweet potatoes. 2. Pay attention to the application of seedling fertilizer. In the "wheat-jade-sweet potato" planting model, the corn stalks are cut off immediately after the corn is harvested to avoid blocking the sweet potatoes and affecting their photosynthesis. More importantly, it is necessary to fertilize dioscorea seedlings at one time. Apply 30 tons of clear manure water, 30 kilograms of ammonium bicarbonate or 10 kilograms of urea, 10 kilograms of ammonium phosphate, and 15 kilograms of potassium sulfate per acre (pay attention to light nitrogen, heavy phosphorus, and heavy sulfuric acid). Potassium), make the seedlings of Dioscorea scutellaria spp. grow vigorously, ensure sufficient photosynthesis, synthesize more dry matter and transport it to the roots, so that they grow up early. 4. On-site management 1 Weeds During the growth period of Polygonum, a variety of weeds tend to grow in the field, and weeding needs to be done manually 2 to 3 times in the field to prevent the weeds from absorbing nutrients in the soil and blocking the Polygonum. 2. During the growth process of Polygonum multiflorum, it is necessary to lift the vines twice to prevent the growth of adventitious roots. If Weiwei has adventitious roots, it will affect the dry matter produced by photosynthesis and cannot be completely transported to the roots, seriously affecting the yield. Lifting the vine is not turning the vine. The process of turning over vines disrupts the normal distribution of leaves and greatly reduces photosynthetic capacity and accumulation of photosynthetic products. Moreover, when pruning vines, the stems and leaves will regenerate after being injured, consuming nutrients and affecting the normal nutrient accumulation of the roots, resulting in reduced yields. The more times you plow the vines, the greater the yield loss. 3. Soft rot and black spot are the main diseases to control pests and diseases. Its control should first select disease-resistant varieties, then treat the seedlings with carbendazim, and then rotate crops. Once the disease occurs, prevention should be carried out immediately. The main pests and diseases to be controlled include sweet potato hornworm, leaf beetle, tortoise shell, spotted leafminer, etc.

The first prevention and control measure is to use frequency vibration insecticidal lamps to trap and kill adult insects; the second is chemical control, that is, spraying 25% dichloride solution 2000 times in early June, early July, and early August respectively. How to grow red yams? High-yielding cultivation techniques for weicae. 5. Harvest at the right time. When the leaves of the vines begin to turn yellow, they can be harvested when the temperature is lower than 20°C. Harvesting too early will affect the yield. It is required to dig the seeds before the end of October (before frost), and try to avoid digging red buds when digging. The high yield of sweet potatoes plays a huge role in local food production and livestock industry development. Hope the above content is helpful to you. If you want to know more about agricultural technology, please pay attention to Huinong School.