For seeding, as in for transplant later. Or to grow in permanently?

I use #72 cell packs for my corn, sowing either 2 or 3 kernels per cell depending upon variety. I generally thin to 2 plants when I plant it out. I have to water usually just once a day in this size cell, sometimes twice if hot and sunny, or every other day if dark and cool. Transplant out at about 6 to 8 inches tall. Works very well.