Calculating NPK
http://www.atlantishydroponics.com/tag/n-p-k-ratio.aspx
ppm caluculator in NPK
http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm
ppm schematic diagram
http://blea.ch/wiki/index.php/PPM_Meter
related literature
http://www.outsidepride.com/soil-test-kits/4-way-soil-test-kit.html
http://www.outsidepride.com/soil-test-kits/1860-soil-tester.html
Tuesday, May 11, 2010
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