Hydroponic Garden forum from Garden Web-
forums.gardenweb.com/forums/hydro/

Utah State University Crop deficienies on Soybean and Sunflower leaves-
www.usu.edu/cpl/research_hydroponics4.htm

Crop deficienies on Tomato plants (links to other crop plants)-
www.luminet.net/~wenonah/min-def/tomatoes.htm

General Hydroponics (GH) & GHBB (major manufacturer of nutrients, addatives, systems and more)-
www.genhydro.com

American Agritech (major manufacturer of nutrients, addatives, and systems)-
www.americanagritech.com

Canna (nutrients, additives and coco media from Holland)-
www.canna-hydroponics.com

Fox Farm (organics manufacturer of nutrients and soils)-
www.foxfarm.com

Dutch Master (nutrient and additive manufacturer from Austrailia)-
www.dutchmaster.com.au

Ferry Morse Seeds (The Hand That Seeds The World)-
www.ferry-morse.com

Dancing Tree Farm (organic heirloom seed company, local Bend grown)-
www.dancingtreefarm.com

University of Florida Deficiency and Toxicity Symptonms-
http://hort.ufl.edu/teach/orh3254/DefSymptoms.htm