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 Sah, R. N. Articles by Hafez, A. A. Search for Related Content PubMed Articles by Sah, R. N. Articles by Hafez, A. A. Agricola Articles by Sah, R. N. Articles by Hafez, A. A.

Phosphorus Behavior in Flooded-Drained Soils. II. Iron Transformation and Phosphorus Sorption

Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616

*Corresponding author.

ABSTRACT

Effects of flooding periods (FP), organic matter (OM) and temperature treatments during flooding on Fe transformation in flooded-drained (FD) soils were studied on four soils representing wide variations in the effect of FD conditions on P sorptivity. The soils were extracted in sequence with ammonium oxalate at pH 6 (amorphous FeA) and at pH 3 (amorphous FeB), and with dithionite-citratebicarbonate reagent (free Fe oxides). The amorphous FeA fraction increased with FP, OM treatment, and elevated temperature. In soils with low amorphous-Fe to free-Fe-oxide ratio, both amorphous FeA and free Fe oxides increased at the expense of amorphous FeB as the FP increased. In soils with low amorphous-Fe to free-Fe-oxide ratio, both amorphous Fe fractions (A and B) increased at the expense of free Fe oxides as FP increased. For all soils, the Fe transformation during soil flooding was accelerated by OM and high-temperature treatments, both of which contributed to a decreased redox potential in the soil. Amorphous FeA fraction correlated well with P sorption under all combinations of OM and temperature in each soil, while other Fe fractions correlated well only under certain conditions. Results suggest that the nature and the magnitude of Fe transformations in these FD soils depend on interacting effects of FP, OM, and temperature.

Contribution from pep. of Agronomy and Range Science,Univ. of California, Davis.

Received for publication June 9, 1988.

This article has been cited by other articles:

				R. E. Casey, M. D. Taylor, and S. J. Klaine Mechanisms of Nutrient Attenuation in a Subsurface Flow Riparian Wetland J. Environ. Qual., September 1, 2001; 30(5): 1732 - 1737. [Abstract] [Full Text] [PDF]

				C. A. Johnston, S. D. Bridgham, and J. P. Schubauer-Berigan Nutrient Dynamics in Relation to Geomorphology of Riverine Wetlands Soil Sci. Soc. Am. J., March 1, 2001; 65(2): 557 - 577. [Abstract] [Full Text] [PDF]

				S. D. Bridgham, C. A. Johnston, J. P. Schubauer-Berigan, and P. Weishampel Phosphorus Sorption Dynamics in Soils and Coupling with Surface and Pore Water in Riverine Wetlands Soil Sci. Soc. Am. J., March 1, 2001; 65(2): 577 - 588. [Abstract] [Full Text] [PDF]

				Yadvinder-Singh, A. Dobermann, Bijay-Singh, K.F. Bronson, and C.S. Khind Optimal Phosphorus Management Strategies for Wheat-Rice Cropping on a Loamy Sand Soil Sci. Soc. Am. J., July 1, 2000; 64(4): 1413 - 1422. [Abstract] [Full Text]

				J.R. Axt and M.R. Walbridge Phosphate Removal Capacity of Palustrine Forested Wetlands and Adjacent Uplands in Virginia Soil Sci. Soc. Am. J., July 1, 1999; 63(4): 1019 - 1031. [Abstract] [Full Text]