If soils are too acidic, phosphorus reacts with iron and aluminum, making it unavailable to plants. But if soils are too alkaline, phosphorus reacts with calcium and also becomes inaccessible. However, liming can influence other ways by which phosphorus might become available to plants.

While lime can be applied anytime, including winter, Penn State Extension offers a few recommendations for when to make an application.

Regular soil sampling is essential for balancing soil nutrient levels and can serve as a barometer of soil health and productivity, says Penn State Extension.

The University of Florida IFAS Extension recommends considering the cost of the lime, its calcium carbonate equivalent and spreading rates when choosing a lime source.

This agronomy fact sheet offers a summary of about a dozen important points about soil acidity and ag lime.

Correcting acid soil conditions through the application of lime can have a significant impact on crop yields, especially alfalfa.