Transplant mix

For 120 x 4" tall square cowpots @ 670 ml each:  80,400 ml mix needed.

Base = ~6.5 bags Jiffy seed starting mix = 6.5 x 12 quarts =78 quarts.
Add 8 quarts perlite = 86 quarts mix.  = ~2.9 cubic ft.
Add to this 2 cups plant food per cu ft = 5.8 cups plant food. Prob should reduce it to 5 cups, because the perlite and jiffy mix each have a little food already.
= ~ 87 quarts = 82,000 ml.