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    Nitrogen and Phosphorus Changes in Soil and Soil Water after Cultivation by Mark Watkins, Hayley Castlehouse, Murray Hannah, David M. Nash

    Published 2012-01-01
    “…In all cases, the P concentrations (Olsen P, Colwell P, Total P, CaCl2 extractable P, Dissolved Reactive P, and Total Dissolved P) in the top 20 mm declined with ploughing. …”
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