Quote:
Originally Posted by heynow
It appears sul po mag and K-mag is the same thing. I get mine from a fertilizer store for under 10 dollars for 50 pounds and mix it with 8-2-8 I get from the same store.
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There are some slight variations amongst the various suppliers. Some are mined in Canada and others in Mexico, and I believe there's another site in the USA by different companies, and sometimes, different mineral type sources. But I agree that they could contain more or less the same ranges of compositions of nutrients.