高接树脐橙次生果黄化与矿质营养关系初探

A PRELIMINARY RESEARCHE ON RELATION BETWEEN XANTHOCHROISM OF SECONDARY FRUIT OF HIGH GRAFTING NAVEL ORANGE AND MINERAL NUTRITION

本文研究了高接五年与高接三年的罗伯逊脐橙树幼果矿质养分含量。其结果表 明：Ｃａ、Ｎ是高接五年的高于或显著高于高接三年的树；Ｋ则相反，是高接五年 的显著低于高接三年的树；其它养分如Ｍｇ、Ｆｅ、Ｍｅ、Ｍｎ、Ｃｕ、Ｚｎ均有高接五年的高 于高接三年树的趋势。高接后当年的罗伯逊脐橙树细根可溶性碳水化合物含量 显著低于对照。高接后初结果树脐橙次生果黄化落果率高，与钙营养失调密切 相关。可溶性碳水化合物供给下降，使根系退化，新生根系受抑制。是导致钙 营养失调的重要因素。

The researches demonstrate as follows; the mineral nutrition content Ca, N in young fruit of Robertson's navel orange tree, grafted high five years ago, is more than, even much more than that of the same tree, grefted .high three years ago. As regards the mineral nutrition content K in these two kinds. of trees, the proportion is just inverse. If the former is compared with the latter, except P, the other ingredients such as Mg. Fe, Mn. Cu, Zn all possess a rising tendency. After Robertson's navel orange graftiong in that very year, the content of soluable carbohydrate in its fine root is obviously lower than that of the contract. High, rate of the yellowing secondary fruit falling of the first bear ing fruit tree after grafting is closely concerned with Ca nutrition disturbance. Decreasing supply of soluable carbohydrate makes the root system degenerate and the new-born root system being restrained. This is an important factor, resulting in Ca nutrition disturbance.