To illustrate how soil electrical conductivity works, Craig Walters uses a science experiment from high school. “Remember in high school when we wrapped nails with electrical wires, turned on a current from a battery, and watched iron filings line up in orderly rows as they became magnetized? “The principal is the same,” said the soil scientist for Pacer Corporation, a Colton, Washington, agricultural consulting firm. Soil is an electrical conductor, made of clay particles that carry positive and negative charges, he said. Most of the positive cations are found in the middle of clay particles where micronutrients are held. Conduction […]