Fertilizer 101 http://www.fertilizer101.org/
Fertilizer use and Price http://www.ers.usda.gov/Data/FertilizerUse
Turf Fertilizers www.lesco.com/?pageid=63
Agriculture
Online Homepage - www.agriculture.com
International
Potash Institute Homepage -
www.ipipotash.org
The
Fertilizer Institute Homepage -
www.tfi.org
The
Lawn Institute Homepage - www.lawninstitute.com
International
Fertilizer Development Center Homepage
-www.ifdc.org
The
International Fertiliser Society - www.fertiliser-society.org
International Plant Nutrition Institute www.ipni.net/ipniweb/portal.nsf
Turf.Net
Com - www.turfnet.com
Nutrients for Life Foundation www.nutrientsforlife.org
Fertilizer Calculator www.crystalsugar.com/agronomy/agtools/npk/Default.aspx
Fertilizer Reckoning For the Mathematically Challenged www.agry.purdue.edu/ext/corn/news/articles.02/fert_math-0326.html
Fertilizer Cost Calculations www.ext.colostate.edu/pubs/crops/00548.htm