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Soil Amendments

Q.What Is Best Proportion Of Soil Sulfur To Gypsum In High pH Soils, To Lower The pH?

Zone Cottonwood, AZ zone 8b | Anonymous added on January 28, 2025 | Answered

I live in AZ. High desert with very high p/h soils. I have used soil sulfur & gypsum before but can’t find the proportions that I used.

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GKH_Susan
Certified GKH Gardening Expert
Answered on January 30, 2025

Aluminum sulfate works faster than sulfur. Care must be taken not to over apply either one. Canadian sphagnum peat moss is acidic and will lower the acidity level when mixed in with garden soil. Gypsum does not affect soil pH so it is not needed. These articles should help:

https://hgic.clemson.edu/factsheet/changing-the-ph-of-your-soil/

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/using-gypsum-in-garden.htm

https://ag.arizona.edu/yavapai/anr/hort/byg/archive/gypsum2014.html

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