Abstract
A laboratory incubation study evaluated the liming properties of North Carolina (NC) and Arad phosphate rocks (PRs). Application of these two reactive phosphate rocks (RPRs) to topsoil samples of a Typic Albaquult and an Andic Eutrochrept at 2 and 4 t ha-1 (3.1 and 6.2 g kg-1 soil) significantly increased soil pH and exchangeable Ca, and significantly decreased 0.02 M CaCl2 extractable Al and exchangeable acidity after 130 d. NCPR caused greater changes than Arad PR in accordance with a higher carbonate content and reactivity and extents of dissolution estimated from increases in exchangeable soil Ca. The effects were small compared to those of an agricultural lime (86.5% CaCO3) at similar application rates. The liming effect generated by the partial dissolution of NCPR was in accordance with the amount of protons consumed during RPR dissolution, and in the soils studied was highly dependent upon the ability of the soils to act as sinks for dissolved Ca (or provide exchangeable acidity) and P. The results suggest that regular RPR use will maintain New Zealand hill country pasture soil pHs in the region of 5.5–5.8.
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© 1995 Springer Science+Business Media Dordrecht
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Loganathan, P., Hedley, M.J., Saggar, S. (1995). Liming effect of reactive phosphate rocks: A laboratory evaluation. In: Date, R.A., Grundon, N.J., Rayment, G.E., Probert, M.E. (eds) Plant-Soil Interactions at Low pH: Principles and Management. Developments in Plant and Soil Sciences, vol 64. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0221-6_102
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DOI: https://doi.org/10.1007/978-94-011-0221-6_102
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