Fertilizer Labels

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Fertilizer labels state the guaranteed minimum, which means there could be more.

Nutrients are listed as a molecule an not a single element

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Ive heard that the numbers that representing NPK, refer to the percentage of how much NPK the bag has, by volume. For example if the bag of fertilizer reads 10 - 5 - 12 the bag contains by volume 10% nitrogen 5% phosphorus 12% potassium the rest is filler. What are your thoughts?

fayjason