|Title:||柑桔、梨及蘋果樹葉片營養診斷之研究||Other Titles:||Studies on Leaf Nutritional Diagnosis of Citrus, Pear and Apple Trees||Authors:||邱再發
|Issue Date:||6-Sep-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||3||Start page/Pages:||214-226||Source:||中華農業研究||Abstract:||
片無機養分化學分析作為葉片營養診斷之基礎研究。氮肥施用量試驗結果，顯示對果實產量每棵50公斤之桶柑及極椪柑樹氮肥施用適量為每棵氮素N 500克。對5年生蘋果及梨幼樹之氮肥施用適量為每棵氮素N 300克。
Leaf analysis of mineral nutrients has been carried out in order to study nutritional diagnosis of fruit trees, i. e. Tankan, Ponkan, apple and pear trees. Leaf samples were taken from these fruit tree orchards that were used for field experiments on nitrogenous fertilizer application. The results of nitrogenous fertilizer trials showed that the optimum nitrogen application for Tankan and Ponkan trees is N 500 g per tree on the basis of 50 kg fruits per tree are produced. The optimum nitrogen application for 5-year-old pear and apple trees is N 300 g per tree.
Leaf nutrient concentrations varied greatly with seasonal changes. The N, P, K and Mg concentrations of Tankan and Ponkan leaves were the highest around August and these nutrient concentrations decreased gradually when the leaves grew older. However, the Ca concentration increased gradually when the leaf age became older. Generally, the leaves from nonfruiting terminals had higher N, P, and K concentrations and lower Ca and Mg concentrations than that from fruiting terminals. Leaf nutrient concentrations were effected by fertilizer application and also greatly effected by soil fertility status.
The N and P concentrations of pear and apple leaves were the highest in the spring new leaves and decreased gradually thereafter. Especially, the N concentration was very high in the young leaves and rapidly decreased as leaf age increased. On the contrary, the Ca concentration increased with leaf age. The K concentration was fluctuated during leaf growth. According to the results of leaf analysis of citrus, pear and apple trees, it is recommended that leaf samples should be taken in August from nonfruiting terminals for the purpose of nutritional diagnosis.
The leaf standard mineral concentrations of Taiwan Tankan, Ponkan, pear and apple trees have been suggested in the following table on the basis of the current research results and information of other investigators.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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