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柑桔叶片主要营养元素含量在年周期中是有波动的。南丰蜜桔、福桔、芦柑和雪柑四个柑桔品种的三个主要物候期叶片分析表明,氮素含量以花芽生理分化期(9～10月)最高,幼果期(5月)次之,花芽形态分化期(1月)最低。磷、钾素含量5月份最高,随着叶龄的增长而逐渐降低。叶片含钙量随着叶龄增长而增加,至9月份以后含量变化不明显。叶片含镁量以5月份新叶最低,后逐渐升高,9月份达到高峰,以后又逐渐降低。各物候期营养元素含量与产量相关性分析表明,花芽形态分化期叶片氮素营养与当年产量相关显著,而花芽生理分化期叶片氮素营养与翌年产量相关不显著。无论是1月份或是9月份叶片含镁量对当年产量均有显著或极显著的相关性。叶片含钾量与产量呈负相关。磷、钙等营养元素与产量相关不显著。
Citrus leaves the main nutrient content in the annual cycle is volatile. The three main phenophase leaf profiles of four citrus varieties, namely, Nanfeng Orange, Fucai, Lugan and Xuepeng, showed that the nitrogen content was highest in the period of flower bud physiological differentiation (September to October) ) Followed by flower bud morphological differentiation (January) the lowest. Phosphorus, potassium content highest in May, with the growth of leaf age and gradually decreased. Leaf calcium content increased with the leaf age increased to content changes after September is not obvious. Leaf magnesium content in May the lowest new leaf, then gradually increased, peaked in September, and then gradually decreased. Correlation analysis of the contents of nutrients and yield in each phenophase showed that there was a significant correlation between the nitrogen nutrition of the flower buds and the current annual yield, while the nitrogen nutrition of the flower buds during physiological differentiation was not significantly correlated with the yield of the following year. Whether January or September leaf magnesium content of the current year production was significant or very significant correlation. Leaf potassium content and yield was negatively correlated. Phosphorus, calcium and other nutrients and yield was not significant.