Abstract: The fluctuation of N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B concentration in fruits of Citrus unshiu at different developing stages differed from that in leaves. Generally, the concentration of the mineral element in fruit was lower than that in leaf; the concentration in fruit reached the peak stags earlier than that in leaf. The changes of concentration of these elements in fruits were more complicated before July. However, they tended to te stable after September. Whether the optimum period for sampling fruit is in September and early October to make the nutrient diagnosis of citrus is also discussed.

Key words: Citrus unshiu, Mineral elements, Fluctuation curve

摘要： 本文分析了温州蜜柑丰产园不同发育阶段的果实氮、磷、钾、钙、镁、铁、锰、锌、铜、硼的含量。矿质元素在果实中的动态变化规律与叶片中的变化规律显然不同。一是含量比叶片低;二是浓度的最高峰期出现比叶片早。果实发育前中期元素含量变化较复杂,9月以后趋向稳定。对可否以9月至10月上旬作为采果样时期以进行营养诊断作了讨论。

关键词: 温州蜜柑, 矿质元素, 动态变化