Cation Exchange Capacity (CEC)
Fact Sheet 22 Cation Exchange Capacity (CEC) Agronomy Fact Sheet Series Department of Crop and Soil Sciences 1 College of Agriculture and Life Sciences Cations are positively charged ions such as calcium (Ca2+), magnesium (Mg2+), and potassium (K+), sodium (Na+) hydrogen (H+), aluminum (Al3+), iron (Fe2+), manganese (Mn2+), zinc (Zn2+) and copper (Cu2+). The Capacity of the soil to hold on to these cations called the Cation Exchange Capacity (CEC). These cations are held by the negatively charged clay and organic matter particles in the soil through electrostatic forces (negative soil particles attract the positive cations).
Fact Sheet 22 Cation Exchange Capacity (CEC) Agronomy Fact Sheet Series Department of Crop and Soil Sciences 1 College of Agriculture and Life Sciences
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