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Reactions Between Monocalcium Phosphate Monohydrate and a Chromic Luvisol: I. The Morphology of Reaction Products¹

ABSTRACT

Samples, in field structural condition, of the surface (BR1) and subsoil (BR3) of a Chromic Luvisol from Mason, County of Cumberland, New South Wales, Australia, were reacted with pellets of monocalcium phosphate monohydrate (MCPM). The reaction products were investigated using a scanning electron microscope and by qualitative electron probe microanalysis. The morphology of many of the reaction products, some of which were crystalline, and others which appeared to be amorphous, was defined. The dominant reaction products were found to be calcium phosphates which usually contained Fe, Al, Mn, Si, and occasionally K dissolved from the soil matrix by the solution leaving the fertilizer pellets.

The dominant reaction products at the pellet sites were found to be dicalcium phosphate dihydrate (DCPD) and dicalcium phosphate anhydrous (DCPA), together with a small amount of MCPM in the case of the subsoil (BR3).

¹ Contribution from Dep. of Soil Sci., Univ. of Sydney, N.S.W., 2006. Australia. This work was supported by research grants from The Univ. of Sydney and the Government of Iran.

² Senior Lecturer in Soil Science, Univ. of Sydney.

³ Formerly Postgraduate Scholar supported by a scholarship awarded by the Ministry of Science & Higher Education of Iran, now located at the Univ. of Technology, Isfahan, Iran.

Received for publication October 1, 1979. Accepted for publication December 10, 1979.