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RE: KNO3 & K2SO4

>Correct me if I
>am wrong, but if you add only KNO3, aren't you adding K and N >in a 1:1
>molecular (not molecular weight) ratio?

this is true. as it happens, KNO3 is about 40% K, 60% NO3 by weight so the ratio you're adding, as we measure it, is about 2 parts K to every 3 parts NO3.