All of the confusion expressed above is further complicated by the nature of the weighted NPK formula system. A bag might say 0-0-60. Does this mean that in a 100-pound bag there are 60 pounds of K, the rest being inert filler? Not exactly.
Acres U.S.A., the monthly magazine of eco-farming, is packed with practical information. But our editors can't fit it all in each month, so some of the richness ends up here. Check out this post, Book of the Week: Eco-Farm, An Acres U.S.A. Primer by Charles Walters, in its entirety and many others in Eco-Farming Daily.