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化隆县黄河河谷地区自一九六一年引种栽培苹果以来,相继发生了幼树越冬伤亡问题。据调查,一九六三年群科园艺场栽培的1100株2——3年生的苹果幼树几乎全部枯死,省甘都农场1800株幼树越冬伤亡率达到98％,甘都苗圃497株幼树,除定植在密生林木苗床中43株幸存外,越冬伤亡率达92％;社队栽培的苹果幼树。越冬伤亡之惨状,更为严重。以后,又于一九六九年和一九七六年发生了全县性的苹果幼树严重越冬抽条伤亡,这两次,对管理粗放,没有施行安全越冬综合措施的苹果幼树伤亡惨重。群科公社
Since the introduction and cultivation of apples in 1961 in the Yellow River valley of Hualong County, overwintering casualties of saplings have occurred. According to the survey, almost 1,100 2-3-year-old young apple trees were planted in the horticultural field in the Hermitage Branch in 1963, with almost 98% of the 1,800 young trees overwintering in the Gandu Farm and 497 young plants in the Gandu Nursery Trees, in addition to colonization in dense forest seedling beds in 43 surviving, the overwintering casualty rate of 92%; community team cultivated apple saplings. The tragic death toll, more serious. Later, in 1969 and 1976, there were serious overwintering splinters of apple-type young saplings across the county. These two times caused heavy casualties for the young saplings that were extensively managed and were not integrated in implementing safe over-wintering measures. . Branch of the commune