According to Lawrence Mayhew, the EarthWorks chemist, calcium is the most important nutrient in plant production. While that may be debated, Lawrence makes a strong case for why calcium deserves top billing in any fertility program.

This episode begins with a discussion about ammonium sulfate and how it can release calcium from the soil colloid, making it more available to plants. Lawrence also explains how the presence of calcium in the soil triggers the release of root exudates, helping the element move into the plant.

The conversation explores different calcium sources, such as various forms of limestone and gypsum, and how they behave differently in the soil. Lawrence dives into the redox chemistry of calcium, explaining its true function in the soil and why it does not directly affect pH the way many assume.

The discussion wraps up with a look at how calcium operates within the plant and practical ways to improve calcium bioavailability.

If you are a fan of soil chemistry and Biological Soil Management, this is a must-listen. Whether you are already a believer in the power of calcium or still skeptical, you will find this episode both informative and memorable.

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