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对朋娜脐橙果实的纵、横径进行了田间测定，对春梢叶片氮磷钾含量进行了分析。其结果为：果实纵、横径净生长量在年变化过程中出现３次生长高峰，纵径比横径早１０ｄ。营养春梢叶片氮磷钾含量在４～５月较低，磷钾６月中旬达最高水平，氮含量８月中旬达最高水平，氮磷钾在７～１０月含量相对稳定。果实纵、横径生长量与叶中氮含量呈极显著正相关，与钾含量呈显著正相关，与磷含量呈正相关，但不显著。即果实大小受叶片中氮钾的影响较大，而磷对果－实大小的影响较小
The vertical and horizontal diameter of the fruit of na navel orange were measured in field, and the contents of nitrogen, phosphorus and potassium in spring shoots were analyzed. The results showed that there were three growth peaks in the net growth of the fruit during the annual change, and the vertical and horizontal diameters were 10 days earlier than the horizontal. The contents of N, P and K in spring leaf tips were lower from April to May, with the highest levels of P and K in mid June and the highest nitrogen content in mid-August. The contents of N, P and K in July and October were relatively stable. There was a significant positive correlation between fruit length and diameter growth and nitrogen content in leaves, a positive correlation with potassium content, and a positive correlation with phosphorus content but not significant. That is, the size of the fruit is affected more by the nitrogen and potassium in the leaves, while the effect of phosphorus on fruit-fruit size is smaller