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The importance of exchangeable cations and resin‐sink characteristics in the release of soil phosphorus
Author(s) -
CURTIN D.,
SYERS J. K.,
SMILLIE G. W.
Publication year - 1987
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1987.tb02168.x
Subject(s) - chemistry , soil water , dissolution , phosphate , sink (geography) , desorption , ion exchange , phosphorus , ion exchange resin , inorganic chemistry , ionic strength , ion , adsorption , aqueous solution , biochemistry , soil science , geology , organic chemistry , cartography , geography
SUMMARY The significance of exchangeable cations in the release of phosphorus by sequential extraction with water was evaluated in 11 acid ( p H 5.0–6.3) New Zealand soils contrasting in P status and P retention. The release of P from Na‐saturated soil exceeded that from the original Ca‐dominated soils by up to four‐fold. Possible explanations for the larger P release in the Na system include: (i) desorption of P induced by increased surface negative potential associated with the exchange of Na for Ca/Mg, and/or (ii) accelerated dissolution of Ca phosphate compounds or complexes resulting from the creation of a sink for Ca. The potential of a series of anion‐ and cation‐exchange resin systems (AER and CER, respectively) as sinks for labile soil P was also examined. For all soils studied, P extracted by AER‐HCO 3