Azomite: This natural rock dust is an aluminum silicate clay mixed with many minerals. It began as an ancient marine deposit and was brought to the surface by volcanic action. It has been in use over 50 years as a source of available potash (2.5%) and over 50 trace minerals, including Calcium (2%), Sodium (1%), Iron (0.5%), and Magnesium (0.5%). Apply at ¼-2 tons/acre, or ¼ to 2 pounds per 10 square feet. Use as annual topdressing where soil pH is 6.8 or lower. Another excellent food supplement (the rock dust described in Secrets of the Soil) renowned for its many remarkable properties. Contains 60-70 trace minerals and is also useful as an anticaking agent. Use at 1-2% of feed mix. Azomite is a volcanic ash from southern Utah a mined mineral product. It requires no mixing or special equipment. It is odorless and won’t restrict aeration or water penetration. It is 100% natural with no additives, synthetics or fillers. Sold in the poultry industry as a feed ingredient. Chemically, Azomite is a hydrated sodium calcium alumino-silicate (HSCAS) containing other minerals and trace elements and is sold as an anticaking agent and is generally recognized as safe (GRAS) by the FDA. Available from Peak Minerals-Azomite, Inc., 101 N. Tejon, Suite 410, Colorado Springs, CO 80903.