The study looked at how different types of anions and increasing levels of calcium and sodium affect how plants absorb potassium from KCl solutions. They found that plants treated with KCl absorbed potassium faster from chloride solutions compared to sulphate solutions. At lower potassium concentrations, absorption rates were similar between nitrate and chloride solutions. High levels of calcium and sodium chlorides boosted potassium absorption in KCl-treated plants at low potassium concentrations. However, at higher potassium concentrations, these ions had no effect on absorption. The results suggest that KCl-treated plants have different potassium absorption characteristics compared to KCl-starved roots, showing increased selectivity for potassium over sodium with longer treatment times.