It's a fabulous way to feed veg, Grubbypaws!
We've used it like that for years, and while JayG is spot on about the analysis, we also used to dilute it with nettle tea and also comfrey tea, and stuff just bounded ahead - especially leeks!
I still have a half bag at home now, but the pong would be too strong as a liquid feed (and no leeks), so over the next season, I'll get some going for a head start next year!
In fact, a quick dose for the beans is now in order, so thanks for the reminder!