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苹果栽培在东北的南部地区已有四十余年的历史。在栽培技术方面具有一定的基础,群众中也存在着丰富的经验。辽南果树增产技术调查组在运方面进行了三年的调查总结工作,取得了一定的成绩。在调查过程中也发现了一些问题,主要是在修剪方面的某些问题上存在着不同的看法。因此在技术推广工作中难免会遇到一些困难,为了使今后工作能更好的发展,有必要对这些问题展开广泛的讨论。辽南地区在过去几年中(主要在1948—1952年)曾经普遍推广以醣氮率(C/N 率)为根据的「四级树」的理论和以中坚点为基准的助势、减势、缓势剪法。这些名词已
Apple cultivation in the northeast of the southern region has more than 40 years of history. In the cultivation of technology has a certain basis, the masses also exist a wealth of experience. Liaonan fruit tree production technology survey team in the transport area for three years of investigation concluded, and achieved some success. During the course of the investigation, some problems were also found, mainly because of different views on certain issues concerning pruning. Therefore, it is inevitable that some difficulties will be encountered in the promotion of technology. In order to make the future development be better, it is necessary to hold extensive discussions on these issues. In the past few years (mainly in 1948-1952) in southern Liaoning, the theory of “four-level tree” based on the sugar / nitrogen ratio (C / N ratio) and the aid based on the center have been widely promoted Potential, ease cut shear method. These terms have been