穴格構型對番茄花蓮亞蔬五號種苗盤根及其生育之影響

Influence of Plug Cell Modification on the Pan Root and Growth of Tomato (Lycopersicon esculentum Mill. cv. Hawlien-Yasu No. 5)

經穴格構型改變後之方型或圓型穴格穴盤均具有減少番茄種苗盤根的效果，在方型側壁漏空處理穴格中，根沿著漏空處向下生長，部份根尖接觸空氣後停止生長並刺激支根產生，去底處理穴格，根生長至底部時停止生長完全無盤根現象。圓型側壁漏空處理穴格同樣可避免根沿著穴格壁盤繞，而底部U型設計可減少根在底部纏繞的機會。幼苗根尖數目亦因穴格構型處理而提高，側壁漏空之方型穴格所培育的番茄四週齡苗根尖數較未處理穴格多218%，去底處理亦提高210%，而圓型穴格則以側壁漏空處理較未處理穴覾格多157%最顯著。由改變構型之穴格所培育的番茄種苗，定植後10天根尖數，方型穴格以完全去底最多，漏空處理次之，圓型以漏空處理穴格最多，對照組最少。且定植苗相對生長速率亦顯著高於末處理組，始花日數較對照組提早2-7天（因苗齡及穴格型式而異）、早期產量亦顯著提高。

Modified inverse pyramid and rounded pyramid ping cell could reduce the pun root of tomato (Lycopersicon esculentum Mill. cv. Haswlien-Yasu No.5) seedling, Inverse pyramid cell with a series of narrow vertical openings in the sidewall (T-A-4) would cause the root tips of seedling to grow along the opening sites and reach the edge of the cell sidewall. Part of rout lips dried up by air prunning and stimulated branch root. Growing in dc-bottom cell (T-O), would stop rout lips' growth as soon as the root grew to reach the cell bottom. Effect of root pruning not only to improve rout growth without pan root formation, but also stimulate brunch root growth. In cell sidewall, treated with a series of narrow vertical openings of the round pyramid cell plug, (R-A-3) could avoid the root circles. The U form bottom (R-U) also reduced the possibility of root circling at the cell bottom. The root lips number of 4-week-old tomato seedlings grown in inverse pyramid cell with T-A-4 treatment and dc-bottom increased 218% and 210% than control, respectively. The round pyramid cell with R-A-3 treatment increased 157%. Owing to root pruning and root induction at the seedling stage, root lip number of tomato seedlings at 10 days after transplanting were highest in dc-bottom cell, the followed by T-A-4 treatment and the lowest in control for the inverse pyramid cell tray. The seedling growth of the R-A-3 cell after transplanting was higher in number of root lips than control in the round pyramid cell tray. The flowering of tomato with modified plug was 2 to 7 days earlier us welt as curly yield.