How Much Soil Sulfur To Use

Asked July 6, 2015, 10:09 PM EDT

I was very disappointed to find that there were no instructions in my soil test reports regarding adding soil sulfur to adjust my vegetable and flower beds to a lower pH. That information was included in previous versions of your soil test reports. My vegetable garden soil pH is 7.4. How much soil sulfur do I need to add to take the pH to 6.0-6.5?

Wayne County Michigan vegetables ph adjusting ph

1 Response

A soil pH of 7 is considered neutral and and while most most vegetable plants do best in soils with a pH in the range of 5.8-6.5, vegetables will grow in soil with a pH of 7.4. So generally lowering pH for vegetables is not necessary which is probably why a sulfur recommendation was not included in your soil test results. This would be a different situation if you were growing crops such blueberries, which thrive in more acid soils (pH 5.0 - 5.5).

Below are links to two articles that speak to the connection of nutrient uptake to pH as well the various options for products which can be used to adjust the pH.
Note on the Clemson article there is a table which will provide you a calculation for the amount of each product to apply. Hope that helps!

http://www.clemson.edu/extension/hgic/plants/other/soils/hgic1650.html

http://hort.uwex.edu/articles/reducing-soil-ph/