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Calcium Retention in Response to Phosphate Sorption by Soils¹

ABSTRACT

Retention of Ca increased in response to P sorption by soils, but was independent of the amounts of added Ca. Rather constant values were obtained for the molar ratio of Ca/P retained (0.19 to 0.34). Retained Ca was essentially recovered in 1M KCl washings in contrast to the fractional recovery of sorbed P. The retention of Ca in response to P sorption by soils is interpreted as arising from a sorption rather than a precipitation reaction, and results from the increase in negative charge induced by P sorption.

¹ Contribution from the Dep. of Soil Science, Massey Univ., Palmerston North, New Zealand. Research supported by the Faculty of Agric. and Hortic. Sciences, Massey Univ., and by the Univ. Grants Committee in the form of a scholarship to the senior author.

² Formerly Graduate Student, currently Postdoctoral Fellow, and Professor of Soil Science, respectively.

Received for publication April 12, 1976. Accepted for publication August 9, 1976.

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