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Soil test results. (Pic)

Here's a photo of my test results.

Beside being low in phosphorus, it looks like my major issue is high pH. If I do the math on the N-P-K requirements, it comes out to only about 1/10 of an ounce of each for a 4 square foot area, which would be the area where my hydrangea is planted. I also have some Espoma soil acidifier which is 30% sulfer......18% combined, and 12% free. How much of this should I add to the soil around the plant? The instructions call for 2 1/2 cups.

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