甘薯是块根作物。它的产量是由每亩株数、单株薯块数和单薯重三个因素构成的。一切栽培管理措施都要围绕处理好这三者的关系,即群体与个体之间的对立统一的辩证关系,使甘薯早结薯、多结薯、结大薯,达到高产稳产。甘薯打顶,即把主蔓的生长点摘除,一般能使薯块增多、薯重增加,是一项增产措施。甘薯打顶后,分枝增多,枝叶繁茂,封垅早,抗旱力增强。分枝上的功能叶片增多,光合作用增强,制造的碳水化合物就多。分枝多且短,缩短了叶片到根部之间输送养分的距离,加速了根部对地上部的水分和养分的供 Sweet potato is a root crop. Its output is made up of three factors: the number of plants per mu, the number of tubers per potato and the weight of potato. All cultivation and management measures should focus on handling the relationship among the three, that is, the dialectical relationship between the groups and the individual unity of opposites, so that sweet potato early tuber, more tubers, knot big potato, to achieve high and stable yield. Sweet potato topping, that is, the growth of the main vine removed, the general increase potato tubers, potato weight increase is an increase in production measures. After the sweet potato topping, branches increased, lush foliage, Feng Zao early, increased drought resistance. The number of functional leaves on the branches increased, photosynthesis increased, the manufacture of carbohydrates and more. Branches more and shorter, shortening the distance between the leaves to the root of the transmission of nutrients, accelerating the roots of the aboveground water and nutrients for