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| 題 名 | 巨量元素缺乏對尾葉桉苗木生長及營養狀況之影響 |
|---|---|
| 作 者 | 程煒兒; 洪富文; | 書刊名 | 林業試驗所研究報告季刊 |
| 卷 期 | 7:2 1992.06[民81.06] |
| 頁 次 | 頁111-120 |
| 分類號 | 436.253 |
| 關鍵詞 | 元素; 巨量; 生長; 尾葉桉; 苗木; 營養; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究旨在探討尾葉桉苗木缺乏巨量元素所呈現之症狀,以及對其生 長和營養狀況之影響,供為研判該樹種養分缺乏之依據,並提供施肥參考。苗木 培育時間計31週,其中後18週特以缺乏單一養分元素之營養液培育苗木。結果 顯示: 1.缺氮老葉先黃化,嚴重時變紅色,較正常植株矮小;缺磷葉脈間呈藍紫色斑塊; 缺鉀下層葉先黃化,上有褐色斑點,葉尖及葉緣呈褐色;缺鈣頂端幼葉出現黑褐 色斑點;缺鎂葉脈間黃化,下層葉易脫落。 2.巨量元素缺乏對尾葉桉苗木影響至鉅者為氮素,其全株乾重僅為完全營養液苗 木之10.5%;其次是缺磷56.3%;缺鎂82.7%;缺鈣91%;缺鉀96.3%,故氮素 為尾葉桉生長之決定性養分。 3.培育於完全營養液尾葉桉苗木葉片中各養分濃度間之比例,可作為診斷其苗木 及生長介質營養狀況之依據;又,所吸取之各養分量,以及各養分元素間之比例 (N:P:K Ca:Mg=4.4:1.2:4.0:2.9:1)可供為尾葉桉苗木栽植於不同生長介質時養分供 應之參考。 |
| 英文摘要 | The aim of this study was to develop a reference for the diagnosis of macronutrient deficiency and for optimum fertilization of Eucalyptus urophylla seedlings in nursery or plantations. The seedlings were grown for 31 weeks in pots of silica sand with the initial 13-week under diluted complete nutrient solution and the final 18-week under single element deficiency nutrient solutions. Visual symptom development was closely examined, and the growth and nutrient status were analyzed at the end of the study. According to the results, the nitrogen deficient seedlings were smaller than the normal, and their old leaves were initially yellowish in color then finally become red. With phosphorus deficiency, leaves of the seedlings turned to dark purplish blue color. Bottom leaves changed to yellowish color, and scorched at leave tip and margin in K- deficiency seedlings. With calcium deficiency, top young leaves of the seedlings had dark brown spots. Old leaves had interveinal chlorosis and dropped prematurely in the magnesium deficient seedlings. The growth of Eucalyptus urophylla seedlings were reduced as resulted from the nutrient deficiency. The total dry weight of N-deficient seedlings reduced to only 10.5% of those grown in the complete nutrient solution. And, with the deficiency of P, Mg, Ca and K, the total dry weight reduced to 56.3%, 82.7%, 91% and 96.3%, respectively. This indicated that nitrogen would be the crucial nutrient for the growth of Eucalyptus urophylla seedlings and the importance of phosphorus came next to nitrogen for the seedlings growth. The abnormal growth of nutrient deficient seedlings was partially caused by the imbalance of nutrient as indicated by the deviation of the nutrient ratio of those nutrient deficient seedlings from those in complete nutrient solution. |
本系統中英文摘要資訊取自各篇刊載內容。