in which the initial exchangeable Aluminium was 0.03 cmol/kg. Ca(H2PO4)2H2O (Analytical Grade)
was used to supply the raw soil with additional 100 mg/kg P (P2O5) in P1Al1 and P1Al0 treatments. Other nutrients were applied to each pot at the following rate per kg of soil: 100 mg N as Ca(NO3)2, 400 mg K as K2SO4, 40 mg Mg as MgSO4, 0.2 mg B as H3BO3 and 0.1 mg Mo as (NH4)6Mo7O24.