修剪對鳳梨釋迦新梢生長及開花之影響

Effects of Pruning on New Shoot Growth and Flowering of Atemoya (Annona squamosa×Annona cherimoya)

為探討不同時間與不同程度修剪對鳳梨釋迦新梢生長及開花之影響，本研究以8年生之植株分別於2月至4月進行不同時間修剪，並在3月進行不同程度修剪。結果修剪時間越早，萌芽所需時間越長；而留節數超過4節者，其萌芽率隨著留節數的增加而降低。不同時間修剪比較，以3月修剪者新梢平均長、枝徑最大；而不同程度修剪比較，則以留2節修剪者枝徑最大。2月及3月修剪者每結果枝花數顯著高於4月修剪者。而隨著修剪程度減輕，每結果枝之開花數亦隨之減少。花朵大小則不受修剪時間與程度所影響。綜合試驗之結果，3月為修剪的適當時間，而留節數則以不超過4節為宜。 The effects of pruning time and pruning strength on shoot growth and flowering in atemoya plants. Were studied. Eight-year-old trees were pruned in February, March, or April. Different pruning strengths were employed in March purning. It was found that the earlier pruning month the longer time between pruning and budbreak. The budbreak percentage decreased when 6 or 8 nodes were left unpruned. The length and diameter of new shoots were greatest in March pruned trees. The average length and diameter of new shoots grown on 2 nodes left unpruned were the greatest. Trees pruned in February or March had more flowers per shoot than those pruned in April. The number of flowers per shoot decreased when more nodes on a branch were left unpruned. There was no significant difference in flower size among all treatments. Pruning in March leaving no more than 4 nodes per branch is suitable for atemoya.