近年来，朝阳市苹果生产发展很快，但良种比重小，国光等老品种的栽培比例仍达80％左右。为适应果业商品经济的需要，我市于1992年开始通过高接换头以宁丰、宁酥、岳红、金星、丹光取代国光、倭锦等老品种，并取得了显著效果。高接方法有春季多头技接、初秋多技芽接、春季倒干 In recent years, the production of apple in Chaoyang City has developed rapidly, but the proportion of fine varieties is small. The cultivation proportion of Guoguang and other old varieties is still about 80%. In order to meet the needs of the fruit commodity economy, the municipality began to replace the old varieties of Guoguang and Sojin with Ningfeng, Ningsu, Yuehong, Venus and Danguang in the year of 1992 and achieved remarkable results. High access methods have long spring technical connections, early autumn and more skillful pick then dry in the spring