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TECHNICAL REPORTS

Plant and Environment Interactions

Phosphorus Availability for Plant Uptake in a Phosphorus-Enriched Noncalcareous Sandy Soil

^a Alterra, Wageningen University and Research Centre (WUR), P.O. Box 47, 6700 AA, Wageningen, the Netherlands
^b Department of Soil Quality, Wageningen University, WUR, P.O. Box 8005, 6700 EC, Wageningen, the Netherlands

^* Corresponding author (gerwin.koopmans{at}wur.nl).

Received for publication June 25, 2003. Mining soil phosphorus (i.e., harvesting P taken up from the soil by a crop grown without external P addition) has been proposed as a possible management strategy for P-enriched soils to decrease the risk of P leaching. We performed a pot experiment in a greenhouse where grass was cropped on a P-enriched noncalcareous sandy soil at zero P application over a period of 978 d. We determined the long-term availability of soil P and evaluated the effectiveness of mining soil P to decrease P in different pools. There were two treatments: soil layers in the pots of either 5 or 10 cm thickness. Soils were analyzed at various stages of the experiment. Phosphorus in soil solution and the total pool of sorbed P were estimated using 1:10 (w/v) 0.01 M CaCl₂ extracts and acid ammonium oxalate (P_ox), respectively. A desorption isotherm was constructed, which described the relationship between P in soil solution and the total pool of sorbed P for the soils of the 5- and 10-cm treatments. The Langmuir equation gave a very good description of the isotherm. In the long-term, 65% of P_ox in the initial soil can be removed by plant uptake, as was calculated from the Langmuir equation and a critical P concentration in soil solution at which P uptake can just be maintained. Thus, P_ox may be largely plant available. From the strong nonlinearity of the desorption isotherm, it can be understood why the relative decrease of the P concentration in the CaCl₂ extracts was much larger than the relative decrease of P_ox. Mining soil P decreased the P concentration in soil solution effectively and, therefore, risk of P leaching from our P-enriched soil.

Abbreviations: FeO-P, phosphorus extractable with a filter paper strip impregnated with iron oxide • P_AL, phosphorus extractable with acetic acid and ammonium lactate • P_ox, ammonium oxalate–extractable phosphorus • P_w, water-extractable phosphorus

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This Issue in Journal of Environmental Quality

JEQ 2004 33: 799-804. [Full Text]  

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				G. F. Koopmans, W. J. Chardon, and R. W. McDowell Phosphorus Movement and Speciation in a Sandy Soil Profile after Long-Term Animal Manure Applications J. Environ. Qual., January 9, 2007; 36(1): 305 - 315. [Abstract] [Full Text] [PDF]

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