Indeed, the numbers represent percentages by weight. If you mix equal
weights of these two, you will get 2.5-5.5-5.5.
That is, if you take 10 lbb of the first, you will have 0.5 lb nitrogen
and 0.1 lb each of phosphorus and potassium. Then, if you take 10 lbb
of the second, you will have 1 lb each of phosphorus and potassium.
Combining them, you will have 20 lbb of fertilizer with 0.5 lb nitrogen
(2.5% of 20 lbb) and 1.1 lbb each of phosphorus and potassium (each 5.5%
of 20 lbb).
David E. Ross
Climate: California Mediterranean
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