High-yielding Cultivation Techniques of Sweet Potatoes in Summer

Summer field sweet potato is an important food and feed crop in Guangdong Province. It has a large area for planting, high yield but unbalanced, and has great potential for increasing yield. In order to seize the harvest of summer sweet potato, we should effectively grasp the following five aspects of technical links: 1. Select high-quality, high-yield and improved varieties. For food, sweet and high-quality varieties should be selected, such as "Guangshu 111" and "Pu potato", etc., and high-yielding varieties such as "Chaoshu 1, 2" should be selected as feed. All localities should use local varieties suitable for local conditions and high yields. 2, rush to plant the season early. Summer field sweet potato growth period is from high temperature to low temperature, but also hot and cold crops. Therefore, it should be plucked early in the high temperature and light season to facilitate growth, and strive to plant in the "early autumn" before the end of the season, in order to ensure adequate growth of vines in warm weather, accumulated more nutrients, promote the expansion of potato chips and high yield. At the same time, it should be based on the characteristics of summer fields, sweet potato, and dry and wet, and the characteristics of sandy soil and loam soil should be selected for planting. It should be as close as possible. 3, rational close planting strains. Appropriate increase in the number of plants is the key to winning high yields. It should be changed to planting and planting as a small planting plant. Mu 2650-2850 seedlings is appropriate. 4, covered with straw. This is a new technology to increase production, practice has proved that summer potato cover straw, moisture in the early and mid-term temperature adjustment, late heat preservation moisturizing and preventing cold; prevent weeds and adventitious roots breeding, water loss and soil erosion control, prevent potato cracking, keep potato block smooth, To increase production; can also increase soil potassium fertilizer and organic fertilizer, improve the soil pellet structure. 5. Strengthen field management. The cultivation and management of the field sweet potatoes is focused on doing a good job of fertilization, irrigation and rowing and pine soil. Fertilizer should be applied to the base fertilizer, apply organic fertilizer and plant ash, mu 25-30 kg of lime powder to promote early growth and long tuber. Early weeding in the seedling stage combined with topdressing twice, with urea and water and fertilizer thin application of growth. In the post-swelling period of the potato block, the fertilizer should be re-fertilized with nitrogen and potassium as the main ingredient, and 28 kg of urea and potassium fertilizer can be used to promote the expansion of the potato block. At the end of October, 20-30 metric tons of fertiliser and 5-6 kilograms of mixed urea were planted in order to keep the green and mature vines, extend the growth period, and achieve high yields and incomes. When re-applying the tubers to expand the fertilizer, high-thickness soil should be combined to increase the growth of the tubers and prevent pests and diseases. The whole period should be reasonably drained, in case of dry weather irrigation, irrigation should be carried out before 10:00 am, and it should not be filled with water in the hot sun at noon; it should be drained in a rainy day to prevent waterlogging. At the same time, we should do a good job of controlling worms, wheat moths and scabs to ensure the normal growth of sweet potatoes.