河北省张家口地区已建成40多万亩的国家级脱毒薯繁种基地,年产种薯7亿公斤,不仅销售到河北、山东、安徽等10多个省、市,每年还出口美国50多万公斤。张家口地区是全国脱毒薯重点地区, In Zhangjiakou, Hebei Province, more than 40 million mu of national-level drug-free potato breeding bases have been established, with an annual output of 700 million kilograms of seeds. The products are not only sold to more than 10 provinces and cities in Hebei, Shandong and Anhui, but also exported to the United States more than 50 times a year Million kilograms. Zhangjiakou area is the key areas of the country virus-free potato,