Yep. I did an experiment. Took a bag of M.R.Compost and poked holes in it. Turned over and cut out a rectangle around the top. Bag was about 2x2.5 feet. Took a bag of top soil and did the same, kept it close by. In between, I mixed half Mel’s mix and half M.R.Compost together. Compost was the winner by a landslide. Mixture was second place and top soil lost big time.
Yep. I did an experiment...Very interesting. I could try that with lettuce right now actually... (or maybe in a couple of weeks; we're in Illinois)...