PO 15. Convert fertilizer analysis from elemental to oxide form and from lbs/acre to ppm and vice-versa.
Different laboratories and companies report nutrient content in different units. The most common are ppm (parts per million) and lbs/acre. In addition, the form of nutrients (particularly P and K) can either be presented in the elemental form (i.e., P or K) or the oxide form (K2O or P2O5). Conversion between the different forms and units is important, as one cannot directly compare ppm of P to lbs P2O5/acre.
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