Cation adsorption by cultivated soils
1991
Yoshikawa, G. (Kochi Univ., Nankoku (Japan). Faculty of Agriculture) | Yoshida, T.
Ammonium ion adsorption by 4 cultivated soils, classified as humic andosols (1 soil) and gray lowland soils with andic subsoil (3 soils), was studied. The soils, previously removed native exchangeable bases by treating with NH4Cl solution, were equilibrated at 25 degrees centigrade with solutions of 0.1, 0.01, or 0.001M NH+4, and of varying pH values, prepared by mixing aqueous ammonia with hydrochloric acid. The relation between the amount of NH+4 adsorbed on soil (Eam) and the composition of solution (pH, pNH4) at equilibrium, can be described by a simple equation Eam=f (pH-pHN4). The equation Eam=f (pH-pNH4) or Eam vs. pH-pNH4 curve may be utilized for describing cation retention by cultivated soils
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