Blog, meet Neptune, King of the
As I've mentioned before, we use fish emulsion* to give our soil blocks a little oomph before transplanting them. The product, which is brown and gloopy and smells strongly of fish, has all sorts of helpful nutrients in it to give those little plants a nice start. Transplanting can be traumatic for a plant, so any help we can give them is great.
The method: in a watering can, mix about 1/8 cup of fish emulsion for every gallon of water. And for the love of Pete, do NOT let leftovers sit around. Get rid of them once you're done, or you will be haunted by the scent of the sea forevermore.
*A fancy term for fish guts.