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[APD] N:P ratio in fertilizer

Is C60H87O23N12P a reasonable stoichiometric formula for plant matter?
Perhaps I should use an N:P ratio in the fertilizer which is close to 5:1 or
6:1. How do we compute the N-P mass ratio used for rating fertilizer? P is
expressed as mass of phosphate I think; not sure how the N is expressed.

Steve P

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