一、柑桔营养的研究与进展桔柑营养是高产优质的物质基础,是指导科学施肥的理论依据。桔柑营养的研究已有一百多年的历史。18世纪由于受到分析仪器和测试手段的限制,进展相当缓慢,仅仅是处于启蒙阶段,当时主要是凭外部形态典型特征的变化,来识别和判断营养的盈亏,以经验结合一些盆栽试验进行矫正。到本世纪的20～30年代,随着化肥工业的发展尤其是分析仪器、手段的突破,常规分析进入了仪器分析,在短时间内能分析出许多种元素,提供大量的数据,促进营养研究的飞跃发展。近20年来,国外桔柑营养的研究有很大突破,归纳有以下几点。 1.进一步明确营养元素的生理功能和作用机理。从第一营养元素发展到多元素以及 First, the citrus nutrition research and progress Citrus nutrition is the material basis of high yield and quality, is to guide the scientific basis for fertilizer. The study of mandarin nutrition has a history of over one hundred years. In the eighteenth century, due to the limitations of analytical instruments and testing methods, the progress was rather slow. It was only in the enlightenment stage. At that time, the nutrition profit and loss were mainly identified and judged by the changes of the typical features of external morphology. By the 2030s of this century, with the development of the fertilizer industry, especially the breakthroughs in analytical instruments and instruments, routine analysis has entered into instrumental analysis. Many kinds of elements can be analyzed in a short period of time to provide a large amount of data to promote nutrition research The rapid development. In the past 20 years, there has been a great breakthrough in the research of nutrition of citrus fruits in foreign countries, and the following points are summarized. 1. To further clarify the physiological functions of nutrients and mechanism of action. From the first element of nutrition to the development of multi-element as well