Which mineral is contained in lime that raises the pH of soil?

Lime, often applied to agricultural soils, primarily consists of calcium carbonate (CaCO3). The main mineral that contributes to raising the pH of soil is calcium. When lime is applied to acidic soils, the calcium in lime reacts with hydrogen ions, which are responsible for soil acidity, effectively reducing acidity and increasing pH levels. This process enhances soil health, fertility, and promotes better growth conditions for crops by creating an environment that's more favorable for nutrient availability.

While magnesium (another option) plays a role in soil health and can affect pH when used as dolomitic lime (which contains both calcium and magnesium), it is primarily the calcium content in lime that directly raises soil pH. Potassium and sodium, while also important nutrients for plants, do not play a direct role in altering soil pH through lime application.