Soil pH or soil reaction is an indication of the acidity or alkalinity of soil and is measured in pH units. Soil pH is defined as the negative logarithm of the hydrogen ion concentration. The pH scale ...

Therefore, for optimum plant growth, testing your soil pH and nutrient status every 3 to 5 years is highly ... Consult the Safe Urban Gardening Initiative: Lead Testing with Map and the Garden Safe ...

Somehow, I missed the memo about testing for pH. "Soil pH testing is vital for understanding your soil's chemical makeup and how it affects plant growth," says Greg Niewold of PowerPlanter.com.