5. FERTILIZERS, MULCHES, AND AMENDMENTS, INCLUDING COMPOST, LIME, SULFUR, and GYPSUM

• Univ. of Connecticut Home and Garden Center http://www.ladybug.uconn.edu/factsheets/index.html

• Connecticut Agricultural Experiment Station: http://www.ct.gov/caes/site/default.asp

• Cornell University agronomy fact sheets: http://nmsp.cals.cornell.edu/guidelines/factsheets.html; scientific analysis of numerous plant nutrients; includes fact sheets on pH buffering and cation exchange; written for agronomists, but much useful information for gardeners

• North Carolina Dept. of Agriculture: http://www.ncagr.gov/agronomi/stfaqs.htm; includes,easy-to-understand Qs and As about lime and gypsum

• The Ohio State University Extension Service soils fact sheets: http://extension.osu.edu/topics/garden/soil-compost-and-mulch

• Univ. of Rhode Island Green Share fact sheets: http://www.uri.edu/ce/factsheets/indices/0soilindex.html; lime, soil temperature, nutrient value of organic amendments, and how to mulch

• Univ. Of Wisconsin Soil Science Extension Service: http://www.soils.wisc.edu/extension/; numerous soil science fact sheets

• Washington State Extension Service, Extension Educator Linda Chalker-Scott, www.puyallup.wsu.edu/~linda%20chalker-scott/; research on mulch materials, gypsum, phosphate, Epsom salts; known for garden "myth-busting"

• Fine Gardening magazine, Lee Reich, Ph.D., and others, soil topics, such as understanding pH: http://www.finegardening.com/How-To/Managing-Soil/74874.aspx?channel=3

6. FOR STUDENTS AND TEACHERS

• NASA's soil education program: http://soil.gsfc.nasa.gov/index.php?section=7; includes a garden soil section; suggests experiments

• NASA and NOAA, earth science curriculum: http://globe.gov/

• also see under Geology

7. SOILS IN THE NEWS

• NASA listing of current soil science discussions: http://soil.gsfc.nasa.gov/index.php?section=66

• Science and Development Network: http://www.scid ev.net/en/

• Science Daily: http://www.sciencedaily.com/