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Remember how I experimented with chemical versus organic methods of acidifying the ground for our blueberries?  The results are in, and I'm afraid the chemicals won.

I only had a dozen data points, so the results of my paired t-test weren't significant.  But there was a definite trend toward better health among the blueberries grown on sulfur-treated soil versus those grown on pine-needle-treated soil.  The photo to the right shows one of the stressed plants --- yellow leaves with green veins are a textbook sign of iron deficiency due to high pH.

I guess I'll probably buy some more elemental sulfur to drop the pH in the short term, but will also keep applying pine needles as more of a long term fix.