There's a new place to turn for answers when encountering unusual materials, products or approaches to soil additives and growth stimulants, say University of Wisconsin soil scientists. They've turned a non-conventional soil additives product list into a guide that includes products, companies, ingredients and claims.

The guide, called Non-Conventional Soil Additives, lists 600 products, detailing what they contain, what claims have been made about them, what research has been done and where the research is available.

The guide is on the Web at: www.soils.wisc.edu/extension.