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 Djodjic, F. Articles by Shirmohammadi, A. Search for Related Content PubMed Articles by Djodjic, F. Articles by Shirmohammadi, A. Agricola Articles by Djodjic, F. Articles by Shirmohammadi, A.

Mode of Transport of Surface-Applied Phosphorus-33 through a Clay and Sandy Soil

Swedish Univ. of Agricultural Sciences, Div. of Water Quality Management, Box 7072, S-750 07 Uppsala, Sweden;

Adel Shirmohammadi

Univ. of Maryland, Biological Resources Engineering, College Park, MD 20742.

^* Corresponding author (Faruk.Djodjic{at}mv.slu.se).

ABSTRACT

Phosphorus (P) is the limiting nutrient for primary production in most freshwater ecosystems. The magnitude of P leaching from agricultural soils is therefore critical. Preferential flow has been proposed as a major cause for high P losses in structured clay soils. Undisturbed soil of two texturally different soils, that is, a day soil in which preferential flow was expected to be the main mode of water transport and a sandy soil where piston flow is the dominant process, were used in this study. Use of labeled P made it possible to determine the origin of leached P. An equivalent of 100 kg P ha^–1, labeled with ³³P, was added to the soil surface of each lysimeter. Water equivalents to 100 mm were added on five occasions with 7 d between each watering event. Ponded flow conditions were established during periods when water was added, to trigger preferential Bow behavior. Phosphorus leaching loads from day columns were much higher than P loads from sand columns. The average P leaching load for the five day columns was 4.0 kg ha^–1, compared to only 56 g ha^–1 for the three sand columns. The main part of leached P was in dissolved (PO₄-P) form. The recently added P prevailed in leachate from the clay soil indicating rapid transport of added P from the soil surface through the profile via macropores.

This article has been cited by other articles:

				M. Mamo, S. C. Gupta, C. J. Rosen, and U. B. Singh Phosphorus Leaching at Cold Temperatures as Affected by Wastewater Application and Soil Phosphorus Levels J. Environ. Qual., June 7, 2005; 34(4): 1243 - 1250. [Abstract] [Full Text] [PDF]

				F. Djodjic, K. Borling, and L. Bergstrom Phosphorus Leaching in Relation to Soil Type and Soil Phosphorus Content J. Environ. Qual., March 1, 2004; 33(2): 678 - 684. [Abstract] [Full Text] [PDF]

				M. S. Akhtar, M. S. Akhtar, T. S. Steenhuis, B. K. Richards, and M. B. McBride Chloride and Lithium Transport in Large Arrays of Undisturbed Silt Loam and Sandy Loam Soil Columns Vadose Zone J., November 1, 2003; 2(4): 715 - 727. [Abstract] [Full Text] [PDF]

				P. J. A. Kleinman, B. A. Needelman, A. N. Sharpley, and R. W. McDowell Using Soil Phosphorus Profile Data to Assess Phosphorus Leaching Potential in Manured Soils Soil Sci. Soc. Am. J., January 1, 2003; 67(1): 215 - 224. [Abstract] [Full Text] [PDF]

				F. Djodjic, H. Montas, A. Shirmohammadi, L. Bergstrom, and B. Ulen A Decision Support System for Phosphorus Management at a Watershed Scale J. Environ. Qual., May 1, 2002; 31(3): 937 - 945. [Abstract] [Full Text] [PDF]

				R. Uusitalo, E. Turtola, T. Kauppila, and T. Lilja Particulate Phosphorus and Sediment in Surface Runoff and Drainflow from Clayey Soils J. Environ. Qual., March 1, 2001; 30(2): 589 - 595. [Abstract] [Full Text] [PDF]