異葉銀合歡4個品系(K145，K146，K157，K186)和薩爾瓦多型銀合歡(K28)栽植於林業試驗所太麻里分所海拔900m，土壤pH值約為4.3之試驗地。5年生之胸高直徑生長，異葉銀合歡與薩爾瓦多型銀合歡之間，呈極顯著之差異，但異葉銀合歡不同品系間，並無差異。異葉銀合歡各品系之生長遠比銀合歡為優，5年之生長曲線前者仍在急遽上升，後者卻上升緩慢，且有不增高之趨勢。樹高之生長，異葉銀合歡亦比薩爾瓦多型銀合歡為佳，兩者之間呈極顯著之差異，而異葉銀合歡不同品系間亦無差異。中高海拔地區之樹木生長，往往受制於氣溫，有生長季節之差異。本試驗地之銀合歡類生長，秋冬季幾乎停止，9月份和翌年3月份量測之生長量並無差異。異葉銀合歡品系內單株間之生長變異極大（5年生胸徑變域4.8-20.2cm），應以選種方式予以篩選，培育生長優良單株之互交及自交後代，則此耐寒抗酸銀合歡品系之生長當遠較目前為佳。
Four accessions of Leucaena diversifolia (K145, K146, K157, K186) and one of the giant L. leucocephala (K28) were planted in Tai-Ma-Li Division of Taiwan Forest Institute at elevation of 900m. The soil pH of the experimental field was about 4.3. The data of 5-year old trial showed that there was significant difference between L. diversifolia and L. leucocepliala in both DBH and height growth, but no difference was found among the four L. diversifolia accessions in the two features. The growth curves of L. diversifolia accessions were steep ascendent while the curve of L. leucocephala was almost at its summit.
T-test of DBH of four Leucaena diversifolia accessions in Fall and Spring growth showed that there was no difference between the two seasons. This indicates that there is almost no growth during the fall and winter seasons in this area. Very high variation of growth rate was found in the different individuals within the accession of L. diversifolia. Superior trees of the accessions, and the progenies of selfing or intercrossing of these trees are expected to perform much better on habitats of cool temperature and acid soils.
