河北省甘薯栽培面积很大,由于无霜期较短,多采用育苗移栽方法以延长生长期。苗床复盖物的种类和性质,会直接影响育苗效果和经济效益。最早全用草帘复盖,以维持床温和湿度,促使种薯萌芽和芽苗生长。解放后,为了进一步提高秧苗质量,部分地区改用了油纸复盖;但油纸容易破损,而且桐油在工业上用处很多,不易普遍推广。为了给甘薯苗床找到经济适用的复盖物,我们于1963—1964年进行了甘薯育苗使用塑料薄 Hebei Province sweet potato cultivation area is very large, because frost-free period is shorter, more transplanting seedlings to extend the growth period. The type and nature of the seedbed cover will directly affect the seedling effect and economic benefits. Straw curtain covering the earliest in order to maintain bed temperature and humidity, prompting seed germination and bud seedling growth. After the liberation, in order to further improve the quality of seedlings, oil and paper covered in some areas instead of use; but paper easily damaged, and tung oil in the industrial use of many, not universal promotion. In order to find sweet potato seedbed affordable covering, we carried out in 1963-1964 sweet potato seedling plastic sheeting