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柑桔的上年营养状况,对当年的树体生育有着明显的影响。从水培、砂培和田间肥料试验证明,树体对肥料成分的吸收状况,能在叶成分含量中敏感地反映出来。因此叶片分析不仅能作营养缺乏症的诊断,而且也能判断树体对肥料成分的吸收利用状况,从而了解树体中肥料成分过剩或不足的程度,成为指导施肥的营养诊断法。 日本从1939年开始,逐步发展对叶片分析的研究。左藤等首先进行了叶片分析的一系列工作。他们根据现场调查、砂培和土培的盆栽试验等方法,对有关叶片分析的基础
The nutritional status of the citrus last year had a significant impact on the birth of the tree. From hydroponics, sand culture and field fertilizer tests, it is proved that the absorption of fertilizer components by tree body can be sensitively reflected in the content of leaf components. Therefore, leaf analysis can not only make the diagnosis of nutritional deficiency, but also determine the absorption and utilization of fertilizer components by the tree so as to understand the extent of excess or deficiency of fertilizer components in the tree and become a nutrition diagnosis method for guiding fertilization. Japan from 1939 onwards, the progressive development of the leaf analysis of the study. Left vine and other leaf analysis conducted a series of first work. They based on the site investigation, sand culture and soil culture of potted plants and other methods, the analysis of the basis of leaves