How do you calculate CEC of a soil?

CEC (cation exchange capacity) of a soil can be calculated by measuring the total amount of cations (positively charged ions such as calcium, magnesium, potassium, and sodium) that a soil can hold. This is typically done through laboratory analysis using methods such as the ammonium acetate method. The CEC value is important for understanding the soil's ability to retain and supply essential nutrients to plants.