HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Morel, C. Articles by Pellerin, S. Search for Related Content PubMed Articles by Morel, C. Articles by Pellerin, S. Agricola Articles by Morel, C. Articles by Pellerin, S.

Transfer of Phosphate Ions between Soil and Solution: Perspectives in Soil Testing

INRA-Agronomie, BP 81, F-33883 Villenave d'Ornon cedex, France;
Teagasc, Johnstown Castle Research Center, Wexford, Ireland.

^* Corresponding author (morel{at}bordeaux.inra.fr).

ABSTRACT

Phosphorus inputs must be estimated accurately to optimize the economic return to farmers and minimize P loss from soils to surface waters. Currently, P recommendations are based on the diagnosis of field crop responses by chemically extracted soil P. However, the inability of chemical extraction to characterize plant-available P limits the reliability of these recommendations. Major sources of P mobilized by plant roots include P ions in solution and those from soil constituents, which replenish and buffer solution. A mechanistic evaluation of soil P supply should therefore be based on the description of P ion transfer between soil constituents and solution. Sorption, desorption, electro-ultrafiltration (EUF), and isotopic exchange studies show that an adequate modeling of this quantity [Q_(CP,t)] of P ions must account for both the concentration of P ions in soil solution (C_p) and time (t). In one long-term field experiment, the Q_(CP,t) description was not affected by crop rotation and mineral fertilization histories; therefore, Q_(CP,t) changes are fully explained by C_P changes. In two field experiments, C_P changes were linearly correlated with the cumulative P budget, inputs, and outputs over years. In three field experiments, the soil type effect on the relative maize (Zea mays L.) response curve was taken into account using the ability of soil P to replenish solution P for 1 d. The residual variance of this diagnosis is halved compared to Olsen's extraction. Although more information is necessary, accuracy is improved when soil testing is based on mobility of P ions.

This article has been cited by other articles:

				E. Garnier, S. Lavorel, P. Ansquer, H. Castro, P. Cruz, J. Dolezal, O. Eriksson, C. Fortunel, H. Freitas, C. Golodets, et al. Assessing the Effects of Land-use Change on Plant Traits, Communities and Ecosystem Functioning in Grasslands: A Standardized Methodology and Lessons from an Application to 11 European Sites Ann. Bot., May 1, 2007; 99(5): 967 - 985. [Abstract] [Full Text] [PDF]

				B. L. Allen, A. P. Mallarino, J. G. Klatt, J. L. Baker, and M. Camara Soil and surface runoff phosphorus relationships for five typical USA midwest soils. J. Environ. Qual., March 1, 2006; 35(2): 599 - 610. [Abstract] [Full Text] [PDF]

				Z. Y. Wang, J. M. Kelly, and J. L. Kovar In Situ Dynamics of Phosphorus in the Rhizosphere Solution of Five Species J. Environ. Qual., July 1, 2004; 33(4): 1387 - 1392. [Abstract] [Full Text] [PDF]

				Z. Zheng, R. R. Simard, and L. E. Parent Anion Exchange and Mehlich-III Phosphorus in Humaquepts Varying in Clay Content Soil Sci. Soc. Am. J., July 1, 2003; 67(4): 1287 - 1295. [Abstract] [Full Text] [PDF]