关键词: 马铃薯, 早熟, 石薯 2 号, 选育

Abstract: ‘Shishu No.2’ is a new potato variety of good fresh eating quality，bred through systematic selective breeding by crossing potato varieties ‘Zaodabai’ and ‘Fevureta’．This variety is of early maturity．Its growth period is about 55 days．It has good tuberization ability．Each plant can produce 3-5 potatoes．Its tuber is of oval shape with light yellow peel and yellow flesh．The dry matter content is 21.79%，starch content is 15.5%，reducing sugar content is 0.55%，VC content is 204.5 mg · kg^-1，crude protein content is 21.5 mg · kg^-1．It is moderate resistant to PVX virus．It can yield about 37.5 t · hm^-2．This variety is
suitable for cultivation in the second cropping area of Hebei Province．

Key words: potato；early maturity；&lsquo, Shishu No.2&rsquo, ；selective breeding