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Joseph R. Heckman (January 17, 2002). "Potash Terminology and Facts"(PDF). Plant & Pest Advisory. 7 (13). Rutgers University: 3. Archived from the original(PDF) on July 19, 2011. Retrieved January 29, 2011. Reprinted from Agri-Briefs, from the Agronomists of the Potash & Phosphate Institute, Winter 2001–2002, No.7
Joseph R. Heckman (January 17, 2002). "Potash Terminology and Facts"(PDF). Plant & Pest Advisory. 7 (13). Rutgers University: 3. Archived from the original(PDF) on July 19, 2011. Retrieved January 29, 2011. Reprinted from Agri-Briefs, from the Agronomists of the Potash & Phosphate Institute, Winter 2001–2002, No.7