探明柑桔植株营养元素含量年周期变化规律,是营养诊断研究工作中的重要一环,也是按照果树年周期内不同阶段的营养生理要求指导合理施肥的必要前提。国内外许多学者曾致力于这方面的研讨,并见有诸多报告,特别是甜橙类和宽皮柑桔类。1984年,作者发表过福建柑桔主栽品种——蕉柑有关上述问题的研究。现将我们对本省另一主栽品种——柑的叶片常量元素含量年周期变化规律的研究结果报道如下。 It is an important part of the nutrition diagnosis research to ascertain the regularity of the nutrient elements in citrus plants. It is also the necessary prerequisite to guide the rational fertilization in accordance with the nutrition physiology requirements in different stages of the fruit tree annual cycle. Many scholars both at home and abroad have devoted themselves to the research in this field. There are many reports, especially the sweet oranges and the broad-leaved citrus. In 1984, the author published the Fujian main citrus varieties - banana citrus on the above issues. Now we report the results of the study on the regularity of the annual variation of the leaf element content of the other major cultivars of the province, Citrus, as follows.