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This study trues catried out to examine the effect of seedling age and transplanting depth on the growth and yield of tomato. Tomato cultivar ´Momotaro T-93´ was sown in 72 mL of 50-cell plug tray filled with peatmoss-based substrate without fertilizer on Feb, 4 (75-day old), Feb. l9 (60-day old), and Mar. 6 (45-day old) and transplanted on Apr. 20 for perlite culture. Three transplanting depths (by tap of rootball, cotyledon and lst leaf) were combined with 3 seedling ages of 45-, 60-, and 75-day. The days from sowing to first anthesis and harvest, and the days from first to last harvest of first cluster were shorter in younger seedling. Plant height and stem diameter were not influenced by seedling age and transplanting depth. The cluster-emerged node number was riot affected by transplanting depth, but the second cluster-emerged node number came to lower in 45-day old seedling, Average fruit weight was lowest in first cluster regardless of seedling age. The fruit weight of first and second cluster was lowest in 75-day old seedling, and highest in 60-day old one. The number of marketable Emits was not influenced by transplanting depth, but was most in 60-day old seedling.
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