Lime pH Control
You may need to add lime to your soil if a soil test indicates a pH level below the optimum of 6.0 or 7.0. Soil pH is a measure of a soils alkalinity or acidity. A soil is acidic, or “sour”, if it has a pH below 7.0 (neutral).
Soils can be naturally acidic but can also be acidified over time by natural leaching, the use of some nitrogen based fertilizers, excessive rainfall or irrigation, and acidic water sources.
A pH below 6.0 causes important plant growth nutrients to become “bound up” in the soil