THE EFFECTS OF ADDITIONS OF CaCO 3 AND P ON THE SOIL SOLUTION CHEMISTRY OF A PODZOLIC SOIL

• Published in: Canadian journal of soil science 1988-02, Vol.68 (1), p.41-52
• Main Authors: SIMARD, R.R., EVANS, L.J., BATES, T.E.
• Format: Article
• Language: English
• ISSN: 0008-4271; 1918-1841
• DOI: 10.4141/cjss88-004

The surface horizon from a Humo-Ferric Podzol was amended with both CaCO 3 , and P to investigate the changes in the ionic composition of the soil solution and the charge characteristics of the horizon. Addition of CaCO 3 increased the concentrations of Ca and [Formula: see text] and decreased the total concentrations of Mg, Na, K, Al, Zn, Mn, Si and [Formula: see text] in the soil solutions. In addition, the pH of the soil solutions, the content of negatively charged sites on the soil surfaces, the relative proportion of Mn 2+ and Zn 2+ of sulfate ion pairs were raised. In contrast, the concentrations of exchangeable Zn and Mn, the amount of positively charged sites and the proportion of metals linked with the "modelled" fulvate ligands were reduced. The addition of increasing rates of P reduced the total concentrations of Mg, K, Al, Si, and the concentrations of [Formula: see text] and [Formula: see text] in solution but did not affect the pH or the CEC of the soils appreciably. The concentrations of Si, phosphate-P, [Formula: see text] and of the sulfate ion pairs in solution were increased by increasing P additions to the soil. Key words: Liming, phosphorus fertilization, soil solution, GEOCHEM, ion speciation