MIXING NEW & & garden pH. Q.1 How long does an application of Aluminum sulfate keep the soil ph lowered?

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Changing the pH of Your Soil | Home & Garden Information ...

Two materials commonly used for lowering the soil pH are aluminum sulfate and sulfur. These can be found at a garden supply center. Aluminum sulfate will change the soil pH instantly because the aluminum produces the acidity as soon as it dissolves in the soil.