You will need to know the percentage by weight of the various elements and compounds your amendment supplies. This information can be found on the product label.
A note about P (phosphorus) and K (potassium)… In N-P-K fertilizers, the P listed is actually P2O5; the K listed is actually K2O. We work in P2O5 and K2O so that you may use these values directly from the fertilizer label.
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