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张家口北面坝上(张北台地)是通常供应马铃薯种薯的地区。近年种薯退化显著加重,值得引起注意。现在就退化情况,可能有关的因素和防治措施的意见报告如下。坝上地区马钤薯的主要栽培品种,除了紫山药外,都已经相当普遍地退化了。表1列出最近各地点的调查结果。从1959年到1962年,若干原有品种具有退化症状的植株不断增加,而平均单株产量则尚未相应降低(表2)。
Zhangjiakou north dam (Zhangbei platform) is usually the supply of potato seed potato area. In recent years, degradation of seed significantly increased, it is worth attention. The opinions on the current degradation situation, possible related factors and prevention and control measures are reported below. The main cultivars of potato in the dam area have been quite generally degenerated, except for purple yams. Table 1 shows the survey results for the most recent locations. From 1959 to 1962, the number of plants with degenerative symptoms in several older cultivars continued to increase while the average yield per plant was not reduced accordingly (Table 2).