１甘薯留种的适时收获甘薯收获时期的早晚 ,对留种贮藏有着密切关系。甘薯属无性繁殖体 ,没有明显的成熟期 ,只要气候适宜 ,就能继续生长。所以 ,收获过早，薯块产量就会降低；收获过晚 ,又易受冷害。各地应根据当地的气候特点 ,确定收获期 ,一般甘薯收获期的地温应在１６～１ 1 Sweet potato leaves the timely harvest Sweet potato harvest sooner or later, the remaining species are closely related. Ipomoea vegetative propagules, there is no obvious maturity, as long as the climate is suitable, you can continue to grow. Therefore, premature harvest, potato yield will be reduced; harvest too late, but also vulnerable to chilling. All localities should be based on the characteristics of the climate to determine the harvest period, the general sweet potato harvest temperature should be 16 ~ 1