![]() It is measured commonly in commercial soil testing labs by summing cations (positively charged ions that are attracted to the negative surface charges in soil). The relationship between soil texture and CECĬation exchange capacity is defined as a soil’s total quantity of negative surface charges. Values over 25 meq/100 g soil are found with heavy clay soils, organic, or muck soils. ![]() Soils in Ohio can encompass a wide CEC range, but typically fall somewhere between 5 to 25 meq/100 g soil (Table 1). Soil CEC typically increases as clay content and organic matter increase because cation exchange occurs on surfaces of clay minerals, organic matter, and roots. It is the potential of available nutrient supply, not a direct measurement of available nutrients. Cation Exchange Capacity (CEC)Ĭation exchange capacity (CEC) is a fundamental soil property used to predict plant nutrient availability and retention in the soil. ![]() The purpose of this fact sheet is to define soil cation exchange capacity, base saturation and calcium saturation, and demonstrate how these values are calculated in soil test reports. ![]()
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