WSST Conference 2025

Soil and water are inextricably linked. Negative soil charges, known as cation exchange capacity (CEC), are essential for soil nutrient and contaminant retention, water filtration, and surface and groundwater quality. In this session, we will discuss the basics of how soils get their charge, the impact of CEC on soil and surface water chemistry, and the practical application of CEC to food production and waste management systems. Through easy and visual experiments using ionic dyes and water quality test strips, you will evaluate the CEC of diverse soils and explore the impacts of varying soil CECs on nutrient retention and loss. At the end of the session, you will be able to describe the source of charge in soils, the impact of diverse land management practices on soil CEC, as well as the connection between soil CEC and potential surface and groundwater quality.