What components are typically reported on a standard soil test for turf and how do you interpret base saturation percentages?

• A. pH, electrical conductivity, and extractable Ca, Mg, K, P, Na; organic matter and CEC are rarely reported
• B. pH and organic matter only
• C. pH, EC, extractable Ca, Mg, K, P, Na, and sometimes organic matter and CEC; base saturation percentages indicate the proportion of CEC occupied by Ca, Mg, and K and guide lime or fertilizer decisions
• D. Organic matter content is the sole indicator of soil fertility

Answer: (C)

A standard turf soil test reports pH, electrical conductivity, extractable Ca, Mg, K, P, and Na, and often organic matter and CEC. The base saturation percentages show what portion of the soil’s cation exchange capacity is occupied by the base cations Ca, Mg, and K. This matters because it tells you how much of the soil’s exchange sites are held by these nutrients and thus how responsive the soil will be to lime or fertilizer edits. If pH is low, lime is used to raise it and increase the Ca and Mg saturation where needed; if a specific base is underrepresented, targeted fertilizer or lime products can adjust the balance—calcium- or magnesium-rich lime to modify Ca/Mg saturation, or potassium fertilizer to boost K. In short, the test population you see in practice includes those nutrients and sometimes organic matter and CEC, and base saturation guides practical lime and fertilizer decisions by showing how the soil’s exchange sites are occupied by the major base cations.