K-Mag® fertilizer has an analysis of 21 to 22 percent potash, 10 to 11 percent magnesium and 21 to 22 percent sulfur. K-Mag, or potassium magnesium sulfate, is 100 percent water soluble and will work immediately upon application provided there is enough soil moisture to support crop growth. It contains less than 2.5 percent chloride to help prevent fertilizer burn and has a neutral pH, meaning K-Mag will not change soil pH regardless of application rate.
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