The most advanced in terms of organic/ecological oriented soil testing & consulting operations I know is Woods End Lab, based in Maine. Will Brinton has developed some cutting edge testing for soil biological activity and compost maturity. Contact them at: Old Rome Rd., Rt. 2, Box 1850, Mt. Vernon, ME 04352 (207) 293-2457 fax: (207) 293-2488 Grace Gershuny USDA, National Organic Program