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我园现有十三年生李子树近八百余株。有大、小红袍、红、黄干核、东北美丽、牛心和小黄李子等十余个品种。由于多年受“四人帮”的干扰破坏,放松了管理,定植后一直没有更新复壮,树势衰弱,下部光秃,每年抽不出新枝,产量很低。加之品种繁多、杂乱、特性各异,成熟期不一致,不便采收,不便防虫,近几年已失去生产价值。粉碎“四人帮”后,于一九七七年,在全面分析李子存在问题的基础上,决定结合大更新,改换北方一号和吉林六号等新品种。经过二年来的实践,我们认为结合大更新,采用切接和芽接相结合,一年完成更新换种的方法,是行之有效的。据78年11月16日调查,更新后第二年,树的平均高度比更新回缩时高二倍,冠径大3.9倍。
I park there are 13-year-old plum trees nearly eight hundred strains. There are large and small red robe, red, yellow dry nuclear, beautiful northeast, beef heart and small yellow plums and so on more than ten varieties. Due to many years of interference and destruction by the “gang of four,” the management has been relaxed. After the planting, there has been no renewal and rejuvenation. The trees are weak and the lower part is bare, and new branches can not be extracted every year. The yield is very low. Coupled with a wide variety, messy, different characteristics, inconsistent maturity, inconvenience to harvest, inconvenience pest control, in recent years has lost its production value. After smashing the “Gang of Four,” in 1977, on the basis of a comprehensive analysis of the existing problems of the plums, the two sides decided to change the new varieties such as the Northern One and the Jilin Six with the great renewal. After two years of practice, we believe that combined with a large update, the use of cut and pick together, one year to complete the replacement method is effective. According to a survey conducted on November 16, 1978, the average height of trees in the second year after the update was two times higher than that of the updated ones and the crown diameter was 3.9 times larger.