臺灣柑橘園含銅量之研究

Studis on the Leaf and Soil Copper Content of Citrus Orchard in Taiwan

銅為柑橘所需微量要素之一，並被認為幾種氧化酵素及一些蛋白質組成分。在本省主柑橘生產區內：宜蘭縣桶柑園內葉銅含量低，臺東縣晚侖夏橙園內葉銅量適當，嘉義縣柳橙園及苗粟縣椪柑園內葉銅量高。一般在土壤pH值較高果園內，葉銅量亦較高。葉銅量較高時，果汁內可溶性固形物量雖不定，但是含量有減少趨勢，則糖酸比亦有增加趨勢。在葉銅量高的椪柑及柳橙園內，果汁抗壞血酸量有隨葉銅增加而減少趨勢。

Copper is a component of several plant oxidases and certain other proteins. It is essential for plant growth. In the main citrus growing area in Taiwan, the Cu concentration of leaves collected from tankan orchard in Yilan county was low, and that from Valencia orchard in Taitung county was in the suitable range and leaf Cu concentration of ponkan orchard in Miaoli county liu-cheng orchard in Chiayi county were high. A positive correlation was found between the pH value of the soil and Cu concentration in leaves. From fruit juice quality related to the concentration of leaf Cu, the more leaf Cu concentration the total soluble solids was variable, citric acid content was decreased, the ratio of soluble solids and acid was incneased. Under the high range leaf Cu in ponkan and liu-cheng orchard the more leaf Cu concentration the lesser the ascorbic acid contained.