Leaching effect on the dissolution of two phosphate rocks in acid soils

M. M. Hanafi, J. K. Syers, N. S. Bolan

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20 Citations (Scopus)


The dissolution of two PR materials, Gafsa (GPR) and Christmas Island A (CIPR), in six acid, Malaysian soils (pH 3.0-5.4) was examined in closed-incubation and open-leaching systems. In the closed-incubation system, dissolution of the reactive GPR was higher (22-71%) than that of the less reactive CIRP (26-42%). In the closed-incubation system the size of the sink for Ca determines the extent of PR dissolution in these high P-sorbing soils. With one exception, the dissolution of both PR materials was larger (56-94%) in the open-leaching system and there was less difference in the extent of dissolution between the two PR materials and among the various soils. Studies of PR dissolution in soils using a closed-incubation system provide information that is less relevant to the field situation than do related studies involving an open-leaching system. -from Authors

Original languageEnglish
Pages (from-to)1325-1330
Number of pages6
JournalSoil Science Society of America Journal
Issue number4
Publication statusPublished - 1992
Externally publishedYes


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