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How to calculate ppm from mq46/24/2023 When phosphorus is listed as P2O5 it is only 43% elemental P and when potassium is listed as K2O it is only 83% elemental K. With our label, this is the case and P is listed as P2O5 (phosphorous pentoxide) and K is listed as K2O (potassium oxide) percentage. That is, it is important to note that the P and K numbers found on the guaranteed analysis do not always reflect the actual amounts of elemental phosphorous and potassium by %. This information becomes important when interpreting the guaranteed analysis. Therefore, listings for the same nutrient may appear to vary on a country-by-country basis.įor example, when looking at our labels guaranteed analysis you will find note that it states Īvailable Phosphate (P2O5).15.0%Īvailable Potash (K2O).14.0% values be presented somewhat ambiguously. Regulations around the world require that NPK. Note that analyzing the ppm from fertilizer labels won't provide 100% accurate ppms.įertilizers sold worldwide are often only required to be listed accurately to within 0.4%. This provides us with enough information to establish a reasonably accurate ppm. It tells us how much of each element is in the bag at percentage weight by volume (%w/v). Above is an example of a nutrient labels guaranteed analysis.
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