关键词: 脐橙, 次生果, 黄化, 矿质营养, 植物营养, 植物矿质营养, 植物营养缺乏症

Abstract: The nutrition ingredient determination of N, P, K, Ca, Mg, Fe, Mn, Cu, Zn in the navel orange trees of different ages shows as fallows:the content of Ca in flower, young fruit and leaf blade for the old tree is larger or much larger than that for the young one;on the contrary, the content of N and K in them for the young tree is larger or much larger than that for the old one;the diversity of the othern utrition ingredients is not obvious. For the first bearing fruit tree, high rate of generation of xanthochroism of secondary fruit of the navel orange is closely concerned with nutrition disorder of Ca in the tree.

Key words: NAVEL ORANGE, SECONDARY FRUIT, XANTHOCHROISM, MCNERAL NUTRITICN, PLANT NUTRITION, MINERAL NUTRITION OF PLANT, PLANTNURITION DEFICIENCY DISEASES