Fertilizer Cost Calculations

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If the cost per pound of elemental P or K is desired, then the guarantee must be changed from P2O5 to P and/or K2O to K. To find the conversion factor, use the ratio of the molecular weight of (2 x P) and divide by the molecular weight of P2O5. A similar approach is used for K. No conversion is needed for N since it is already expressed on an elemental basis.

Authors: 
K.A. Barbarick
Authors: 
D.G. Westfall
Publisher: 
Colorado State University Extension
Year: 
2007