Of the liquids, Neptunes is prob the best due to the hydrolization process. But, I'm surprised no one mentioned Algamin.
http://www.arbico-organics.com/produ...l-conditioners I just LOVE it! I use it thruout the garden along with alternating a 10-3-1 bat guano, a 0-7-0 bat guano; and a straight fish by Neptune. I'm also gonna try working in a little bit of alfalfa meal this year. Organics are long range soil builders. Chemical ferts lead to long range soil depletion.