Was going through some old gardening books I have, when I came across my old copy (1986) of "Designing and Maintaining Your Edible Landscape" by Robert Kourik. It is an excellent book loaded with useful information. I highly recommend you pick up this book. There is a section in there pertaining to green manures and a chart listing dynamic accumulators, which I think you guys will find useful. I have copied 4 pages, and 4 pages only for your benefit. This should fall under fair use of copyright law. fair use noun (in US copyright law) the doctrine that brief excerpts of copyright material may, under certain circumstances, be quoted verbatim for purposes such as criticism, news reporting, teaching, and research, without the need for permission from or payment to the copyright holder. 4 Pages scanned from a book that is over 360 pages. Akin to photocopying a few pages at the library.