Soil absorbing complex The surface of particles of clay, sludge or organic matter carries a negative charge and can attract positive ions (cations) of hydrogen (H+), calcium (Ca2+), magnesium (Mg2+), potassium (K+), sodium (Na+) and others The sum of the smallest colloidal particles in the soil, which determine its ability to contain nutrients (absorbency), is … Continue reading Acidity of soil (pH)