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Using Sulfur to Amend Soil Creates Very Non-Uniform pH

westes Zone 9b California SF Bay
5 months ago
last modified: 5 months ago

I have a raised bed with a Camellia that I amended with sulfur. I am testing six months later, and I spot-tested the pH in two different locations of the raised bed. One location was pH 5.6 as expected, but the second location was pH 3.5!! My test instrument is sensitive, so these are real numbers, although the pH of 3.5 was near the surface so I might have just picked up a lot of sulfur powder. pH 3.5 is 100 times more acidic than the target pH of 5.5, so I may have a serious problem. The plant has yellow leaves, so it looks like I have induced an iron deficiency.


1) What do I do to remediate the iron deficiency?

2) Do I need to invest in remediating the soil pH yet again, or should I just leave it alone and let the pH slowly settle out?

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