喜樹繁殖與枝葉採收之研究（2/2）Study on propagation and leafy stem harvest of Camptotheca acuminata.（2/2）

建置於蓮華池不同栽植密度喜樹枝葉生產試區，以單位面積栽植密度最高的9,000株之枝葉生產收穫量最大，栽植後4個月的第一次收穫量約為1.7公噸/公頃，次年4月第二次收穫量約為4.9公噸/公頃，8月第三次收穫量則每公頃估算為2.2公噸。栽植1.5年之枝葉產量估計約為8.8公噸/公頃，就野外試驗顯示栽植區之喜樹生長，施肥及水分灌溉是喜樹充分生長所必須之栽培條件。
另就建置於台南之喜樹栽植試區，於93年7月栽植後，至93年12月調查，以栽植密度22,000株/公頃試區估算收穫量最大，新鮮枝葉產量可達5公噸/公頃，顯示喜樹栽植初期密植可增加單位面積生產量之結果，但對於後續產量，則有待進一步之枝葉量採收資料加以佐證。
The study on leafy production (B & L) of Camptotheca acuminata of three planting densities, 3,000、6,000 and 9,000 trees/ha were established at Lienhuachih experiment site. The 9,000 trees/ha showed the maximum productivity. From the B&L production of the first harvesting, that harvested after 4 months growth was 1.7 ton/ha and the new sprouting were let it passing through the winter season. The second harvest were on Apr. of the next year. And B & L production reached 4.9 ton/ha, while third harvest (Aug.) was 2.2 ton/ha. The total B&L production of 1.5 years C. acuminata plantation was 8.8 ton/ha. The field practice showed that irrigation and sustaining fertilization can elevated the B&L yield of C. acuminata.
The other C. acuminata plantation was established at Tainan, 6 months later 22,000 trees/ha showed the highest B&L productivity (5 ton/ha). The results reveal that increasing the planting density could increase the unit productivity. We expect the harvesting data 1.5 years of plantation will match the estimated result in the nearly future.