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梨树是我国古老的树种之一,栽培历史悠久,分布很广。但是,现在老梨产区存在的主要问题是劣种梨占的面积很大,如辽宁的北镇劣种梨的株数占总株数的80％以上,陕西渭北老梨区劣种梨占的比重更大。无产阶级文化大革命以来,我所工人和科技人员在毛主席“备战、备荒、为人民”的伟大战略方针指引下,为了尽快地改造劣种,实现梨树良种化,深入梨区和贫下中农一起开展科学实验活动。在大抹头高接方法的基础上,不断实践,不断总结充实完善,提出一套多头高接换种技术。其特点是:(一)充分利用大树原有骨架,接头多,树冠形成快,较大抹头高接法提
Pear is one of the oldest tree species in our country, with a long history of cultivation and a wide distribution. However, nowadays, the main problem existing in the old pear producing area is that the area occupied by inferior pear varieties is very large. For example, the number of inferior pear varieties in North Town of Liaoning accounts for more than 80% of the total number of trees, while that of inferior pear species in the old pear district of Weibei in Shaanxi Greater proportion. Since the Great Proletarian Cultural Revolution, our workers and scientific and technological personnel, under the guidance of Chairman Mao’s great strategic principle of “preparing for war, preparing for waste and for the people,” in order to transform inferior species as soon as possible, realize the thoroughbred transformation of pear trees, Carry out scientific experiment activities. On the basis of big-tying high-access methods, continue to practice, constantly sum up perfect, put forward a set of long high exchange technology. Its characteristics are: (a) make full use of the original tree skeleton, joints and more, the formation of crown faster, larger wipe high access