解放以来,特别是1958年大跃进以来,我省苹果生产有了很大发展。但不少产区还有一定数量的低产品种,影响产量和品质。近年来果区广大贫下中农,遵照毛主席关于“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成。”的教导,积极进行高接换种,效果良好。据1973年不完全统计,全省高接换种共约5万多株。为总结高接换种技术措施,在周至、西安、宝鸡、凤县、潼关等地进行了调查与试验。初报如后。 Since liberation, especially since the Great Leap Forward in 1958, our province has witnessed great development of apple production. However, there are also a number of low-yielding areas in some producing areas that affect output and quality. In recent years, the vast majority of poor and middle peasants in the fruit-producing areas have followed the teachings of Chairman Mao on the principle of “high yielding with good varieties, that is, they can obtain more crops without increasing labor force and fertilizers.” According to incomplete statistics in 1973, a total of more than 50,000 plants were exchanged in the province. In order to summarize the technical measures of high-exchange variety, surveys and experiments were conducted in Zhouzhi, Xi’an, Baoji, Fengxian and Tongguan. After the first report.