CEC (Cation Exchange Capacity)

Cation Exchange Capacity (CEC) measures a soil's ability to hold and exchange positively charged nutrients, called cations. Think of it as the soil's "storage capacity" for beneficial nutrients like calcium, magnesium, potassium, and others essential for plant growth. Soils with high CEC can retain more nutrients and supply them to plants over time, improving fertility. CEC is influenced by soil type, with clay and organic matter generally having higher capacities. Understanding CEC helps gardeners and farmers manage fertilization effectively, ensuring plants get the nutrients they need without excessive fertilizer use.