‘麻豆文旦'春梢生長與結果習性之探討

The Growth of Spring Flush and Fruiting Habit in 'Matou Wentan' (Citrus grandis Osbeck)

‘麻豆文旦’之枝梢落葉率在果實生長期間極小，9月間之果實採收時僅為4%，在2月上旬春梢萌發前為28%，4月上旬春梢萌發後達91%，顯示春梢萌發期間期間，枝梢有大量葉片更換生長之現象，其落葉率因不同生長環境而異。植株春梢萌發率為87.7%，春梢萌發位置以頂梢的83.6%為最多，倒數第二梢11.8%次之，倒數第三梢4.6%為最少。春梢結果枝形成率為66.4%，其在結果母枝之著生位置以頂梢的89.0%為最多，倒數第二梢7.7%次之，倒數第三梢3.3%為最少，且頂梢有較高之帶葉花序。植株春梢結果枝之最後結果率為4.4~6.0%。

The less leaf drop was observed during the fruit growing period on the 'Matouwentan' because leaf drop was accumulated only to 4% in September when the fruits were harvested. Not much of leaf drop was also observed from September to early February of the next year. Before the shooting of spring flush in early February leaf drop increased to 28%. Since then leaf drop increased greatly to 91% in early April. The data showed that most leaf drop occurred in the growth period of spring flush. Meanwhile, different amount of leaf drop varied in different growth environment. Within a plant, 87.7% of the flushes were appeared in the spring and 83.6、118.8、and 4.6% of them were the terminal, the last second and the last third shoot, respectively. Of the spring flushes, 66.4% were able to produce inflorescence, and most of the inflorescences were developed form the terminal shoot, followed by the last second and the last third shoot, they were counted for 89.0、7.7、and 3.3%, respectively. More percentage of leafy inflores-cence were observed in the terminal sho0t, and only 4.4-6.0% of final fruit set were found in the inflorescence shoots.