Drs. G.F. Koopmans : Phosphorus in noncalcareous sandy soils

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5 Mar 2004 16:00
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. O. Oenema (Management of Nutrient Fluxes and Soil Fertility)prof.dr. W.H. van Riemsdijk (Soil Chemistry and Chemical Soil Quality)
Co Promotor: dr. W.J. Chardon

 Leaching of phosphorus (P) may be a serious problem in noncalcareous sandy soils treated with heavy amounts of animal manure. These soils are a risk for nearby surface waters, as P losses contribute to eutrophication. This study was set up to better understand the speciation and desorption of P in these soils, so as to contribute to the development of management guidelines. Soil P was mainly present in the inorganic form, so risk of P leaching from topsoil is mainly related to inorganic P. Mining soil P, that is, harvesting P taken up from the soil by a crop grown without external P addition followed by the off-site removal of the above ground plant parts, was studied as a possible strategy to decrease the risk of P leaching. In a long-term greenhouse experiment, the P concentration in soil solution showed a fast decrease. Mining soil P may be effective to decrease the risk of P leaching from P-enriched soils. However, this suggestion has to be confirmed in the field.
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