sul po mag

marthacr(z5 Me)June 26, 2011

I had a late soil test done on some veg beds this year and now they are already planted. I need to add a small amount of sul po mag or langbeinite and am having trouble finding any to purchase. Normally, I order my soil amendments from Fedco in the winter, but it's too late to buy from them now without an extremely long drive and wasting a whole day. Several garden centers I've called have no idea what it is, one says they can special order it in a 50 # bag, but I need at most, 8 pounds.

Does anyone know of a retail product that will provide all three that a garden center might carry? I live in Maine, can anyone recommend a brick and mortar store that would carry it? Otherwise, I can order online and pay shipping, or I guess I could add them all separately choosing 3 fast acting sources. I'd have to guess on amounts, though.

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You need a real fertilizer supplier, supplier to growers. They probably won't have langbeinite, they will have an equivalent. 22% K, 11%Mag, 11% S. You'll have to look at it carefully to make sure you aren't getting straight Potassium Sulphate, 0-0-22, because sul-po-mag will also be tagged 0-0-22.

langbeinite or not, these are mineral salts and so should be added with good amounts of OM unless your soil is quite high in percent OM, say over 10-12%. Not more than 200 lbs per acre in any case, per year, which is very little per sq yrd!

    Bookmark   June 26, 2011 at 1:02PM
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I couldn't find it anywhere either; I just ordered Aggrand's Kelp & Sulphate of Potash in desperation. I am hoping that it will serve almost the same purpose in the garden.

Here is a link that might be useful: Aggrand - kelp & K

    Bookmark   June 26, 2011 at 4:58PM
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I would think sulphate of potash and magnesium sulphate (epsom salt) will achieve it.

    Bookmark   June 26, 2011 at 5:48PM
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That's what I'm hoping for (crosses fingers for luck)

    Bookmark   June 26, 2011 at 7:22PM
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Sul po mag is great stuff if and only if your soil test shows deficiecy in sul, po, and mag. I've come across this only once, in a situation where grass was turned over to vegetables. Regards, Peter.

    Bookmark   June 28, 2011 at 5:16PM
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There are different paradigms regarding how much constitutes "desired" levels of any mineral.

    Bookmark   June 28, 2011 at 7:58PM
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