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Soil Preparation and Analysis

Subject:  K and Mg?

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Pumpkin Shepherd

Georgetown, Ontario

My soil test is good except for two items. I need more Potassium and Magnesium. Normally this would be easily fixed with K-Mag especially since it is recommending 4 lbs K2O and 2 lbs Mg per 1000 sq feet. The problem is my Sulfur is 161 ppm or Very High according to their test. What fertilizer or fertilizers can I apply to get the recommended amount of K and Mg without adding Sulfur. Thanks

10/20/2016 5:51:05 PM


South Hero, VT

Dolomite might be a good choice for magnesium if your calcium levels aren't too high.

Potassium bicarbonate won't raise your sulfur levels, but is a little pricey. Potassium silicate would be a better choice.

Lime will help lower your sulfur levels.

10/21/2016 3:44:37 PM

Big City Grower (Team Green Gro)


I have had way higher sulphuric levels than that. With no real issues .. but that was 3 years ago.

10/21/2016 6:28:06 PM



Agree with Big City Grower, don´t worry about your sulfur at the level you mentioned, just fix your K/Mg issue with the sulfate version (K-Mag), it won´t change your soil sulfur content significantly, and after some rain the sulfur level will drop (most likely).

10/22/2016 4:45:01 AM

Pumpkin Shepherd

Georgetown, Ontario

Thanks for the advice. My pH and calcium is always a little high so I'll stay away from any lime. It was a really dry year here so I am assuming not very much Sulfur was leached out of the soil which is maybe why it's high as well. I'll go with the K-Mag and see what happens. Thanks again.

10/25/2016 6:02:29 PM

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