Mining soil phosphorus by zero P-application: an effective method to reduce the risk of P loading to surface water

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    This study aims to find field evidence for the effectiveness of P-mining to reduce the risk of P leaching to surface water. In 2002, a P-mining was conducted on four grassland sites in the Netherlands on sand (two sites), peat and clay soils. The mining plots received no P and an annual N surplus of 300 kg/ha/year. Grass was removed by mowing five to seven times a year. At the same sites, the effects of P surpluses varying between 0 and 40 P2O5 kg/ha/year were studied on adjacent plots. Soil samples were collected in late winter (before fertilizer application), early spring and in late autumn at depths of 0-5, 5-10, 10-20 and 20-30 cm and were analysed for total-P and molybdate reactive P (MRP), molybdate unreactive P (MUP - difference between total-P and MRP), water extractable P (PW) P-AL, NH4-oxalate extractable P (POX), Al (AlOX) and Fe (FeOX) and total-P. Mining soil phosphorus by zero P-application over a period of four years led to a strong (30-90%) reduction in both MRP and MUP concentrations in soil solution in the upper soil layer (0-5 cm). The reduction declined with depth and changes were generally not significant in the deeper soil layers. Mining also led to a decline in P pools in the soil solid phase. The largest decline was found in PW and P-AL, whereas reductions in more strongly bound POX and total-P were not significant
    Original languageEnglish
    Title of host publicationDiffuse Phosphorus Loss. Risk Assessment, Mitigation Options and Ecological Effects in River Basins. The 5th International Phosphorus Workshop (IPW5)
    EditorsG. Heckrath, G.H. Rubaek, B. Kronvang
    Place of PublicationSilkeborg, Denmark
    PublisherAarhus Universitet
    Publication statusPublished - 2007
    EventThe 5th International Phosphorus Workshop (IPW5) -
    Duration: 3 Sept 20077 Sept 2007


    WorkshopThe 5th International Phosphorus Workshop (IPW5)


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