It sounds like one of the 'for dummies' books -- they are generally pretty good. You might see if you can find it at a bookstore and look through it. Or check out the comments section on that book at Amazon -- I use those a lot to decide which book I want to buy. The more comments the better!
It apparently outlines a "beyond organic" chemical-free, minimal-intervention method, similar to what Paul described recently in the Critter Care forum. It's exciting when good ideas move from the fringe to the mainstream.
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.
You could also try getting the book through your local library. If they dont have it, try requesting it on Inter-library Loan. This is a good way to check out a book BEFORE you lay down cash for it. Its what I do, all the time.