土豆二季作就是指一年种两茬。即春季种头茬,夏天收获,把新收获的块茎用药剂处理催芽后再种第二茬,把第二茬收获的块茎留作种薯,能减轻退化,提高产量。从1964年开始,我所就在无霜期只有120—130天的长春市摸索土豆二季作的有关问题。1968年获得了小面积试验成功,1969年在长春市郊区“五七”公社分水东队的一亩三分地上获得了可喜苗头。几年来与群众一起经过不断改进,已经大面积推广,据不完全统 Potato two seasons refers to two kinds of crops a year. That is, the first stubble in spring and the second stubble in the summer are harvested after the newly harvested tubers are treated with the medicament, and the tubers harvested in the second stubble are left as seed and tuber, which can reduce the degradation and increase the yield. Since 1964, I have been exploring issues related to the second season of potatoes in Changchun City, where the frost-free period is only 120-130 days. In 1968, the small-area test was successful. In 1969, gratifying signs were obtained on the acreage of the Shui Shui East team in the “May 7th” commune of Changchun suburb. Over the past few years with the masses through continuous improvement, has been large-scale promotion, according to incomplete system