总结卢龙县群众栽培脱毒 甘薯经验，在栽培脱毒甘薯过程 中，除应在培育壮秧，实行壮秧 早栽、合理密植和实施配方施肥 的基础上，及时加强中后期管 理，才能获得丰产丰收。 具体措施：（一）对长势不足 的要及早进行追肥；对长势过旺 的应适当进行提蔓，以减少须 根，或在雨后 Summarize Lulong County people’s experience in cultivation of virus-free sweet potato, in the process of cultivation of virus-free sweet potato, in addition to strong seedlings should be nurtured, the implementation of strong seedling early planting, close planting and implementation of formula fertilization, based on the timely strengthening of the latter part of management, High yield harvest. Specific measures: (a) of the growing lack of early dressing to be carried out; should be properly carried out on the growing boom, in order to reduce the fibrous roots, or after the rain