Pak-choi cv. 'Dai Tokyo' were sown in 72, 128 and 288-cell plug tray to study the cell sizes effects on seedling growth. Results indicated that, no significant difference on the fresh weigh, dry weight, leaf number, leaf area and root length among different cell sizes at early stages, However, the difference among treatments increased and became significant after 12 days of sowing. Seedlings in 72-cell plugs showed the best growth. The root/shoot ratios was found higher on seedlings in 288-cell plugs than those in 72-cell and 128 cells. The relative growth rates of roots and shoot were also found higher at early growth stage and decreased as seedling ages increased. Both the seedlings in 72 and 128-cell plug had the similar trends in plastchron index values, but that of the seedlings in 288-cell plugs was significantly lower.本試驗探討'大東京'小白菜於72、128及288格三種穴盤育苗對幼苗生育之影響，結果顯示小白菜幼苗之單株鮮重、乾重、本葉數、葉面積、葉長、根鮮重、乾重及根長等皆與穴格容積成正相關，且與播種後天數呈二次回歸正相關。播種後9-12天，在不同穴盤間並無顯著差異，隨著播種後天數增加，差異逐漸加大，以在72格穴盤有最佳生育，Plastochron Index(PI)值在72及128穴格趨勢相似，而288穴格為最低。'大東京'小白菜之地下部/地上部比以288穴格者較72及128穴格者高。地上部及根部鮮重之相對生長速率，在播種後初期成最高值，隨播種後天數增加相對生長速率逐漸降低。288穴格苗株在播種後21天之相對生長速率較72及128穴格者小，其後差異減少不顯著
