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題 名 | 土壤pH值對異葉銀合歡苗木生長及養分含量之影響 |
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作 者 | 程煒兒; 潘富俊; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 3:3 1988.09[民77.09] |
頁 次 | 頁133-146 |
分類號 | 436.27 |
關鍵詞 | PH值; 土壤; 生長; 含量; 苗木; 異葉銀合歡; 養分; |
語 文 | 中文(Chinese) |
中文摘要 | 為探討異葉銀合歡(Leucaena diversifolia K156)最宜生長之土壤 pH值 範圍,以及土壤pH值對苗木與土壤養分含量之影響。特以施用石灰之方式,將 土壤pH值自4.35調整至5.0、6.0、7.0及8.0進行栽植試驗,結果顯示:1. 4個 月生異葉銀合歡苗木在土壤pH為5.5-7.0範圍亦即強酸性至中性土壤生長最適 宜。2. 提高土壤pH可增加土壤養分N,P,K,之有效性及 Ca含量,減少Mn 毒害,從而促進根系之生根力及地上部之生長。3. 生長在 pH4.35土壤之異葉銀 合歡苗木葉部,含低濃度Ca(0.92%)及高濃度Mn(390ppm) ,致造成養分不平衡 與毒害,抑制異葉銀合歡苗木之生長。若提高土壤pH 值,則可改善上述情況。 4. 土壤pH值提高後,異葉銀合歡苗木對養分吸取量除pH8.0例外,均顯著增加, pH5.0、6.0與7.0平均吸取量較對照 (pH4.35)超出(%)N130、P172、K79、Ca249、 Mg114和S147。5. 根瘤乾重,固氮酵素活性,以及固氮量等均隨土壤pH值之 提高而增加;至6.0達最高。 pH值為6.0時,其固氮量為對照(pH4.35)之20倍。 |
英文摘要 | In order to detect the effect of soil pH on the growth and nutrient levels of Leucaena diversifolia seedling over 4 months, and nutrient availability of the soil, a greenhouse pot test was conducted in May 1987. Soil pH was adjusted from its indigenous pH values of 4.35 to 5.0, 6.0, 7.0, and 8.0, by using CaCo3. There were 5 levels of soil pHs with 10 replications, and the pots were arranged in randomized block design. One month after germination, seedlings were thinned to one plant per pot. Data of growth and chemical analysis were gathered after harvesting in September, 1987. The results showed: 1.Leucaena diversifolia (K156) grew better in strongly acid to neutral soil, and the optimum soil pH range for its growth was from 5.5 to 7.0. 2.As the soil pH increased, available nutrient N, P, K and calcium levels of soil increased, but manganese levels decreased. 3.Growth of Leucaena diversifolia in soil pH 4.35 was retarded because of nutrient unbalance and toxity which were caused by low concentration of Ca (0.92%) and high concentration of Mn (390 ppm) in the leaves of Leucaena diversifolia. However, this situation could be improved if the pH value of the soil increased. 4.Nutrient uptake increased significantly with increasing soil pH values, except at soil pH 8.0. The difference between the average of pH levels 5.0, 6.0 and 7.0 and control were N 130%, P 172%, K 79%, Ca 249%, Mg 114% and S 147%. 5.Dry weight of nodules, nitrogenase activity, and increments of nitrogen level of Leucaena diversifolia increased with increasing soil pH value, and the highest rate is at soil pH 6.0. And increments of nitrogen level from nitrogen fixation at soil pH 6.0 was twenty times over the control (pH 4.35). |
本系統中英文摘要資訊取自各篇刊載內容。