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    Using nitrogen fertiliser to decrease phosphorus loss from high phosphorus soils

    Dodd, Rosalind; McDowell, Richard; Condron, Leo M.
    Abstract
    Decline in soil phosphorus (P) concentrations is slow, and environmentally significant concentrations of P can be lost to water long after fertiliser application is decreased. One potential method to accelerate the decline in soil P concentrations is to increase plant uptake by applying nitrogen (N). A one-year lysimeter trial investigated P losses to leachate on three soil types receiving three rates of N fertiliser (0, 150 and 300 kg N/ha/yr) and zero or half maintenance P fertiliser, with regular cutting and removal of pasture. Increasing N input increased annual pasture yield and decreased DRP loss in leachate compared to the zero N treatment, without increasing nitrate or ammonium loss. Furthermore, treatments receiving half maintenance P at all N rates had lower P losses than the zero N and zero P treatment. Based on a cut and carry system, increasing N fertiliser in conjunction with decreasing P fertiliser has potential as a mitigation strategy to decrease P loss without compromising yields or increasing N leaching.... [Show full abstract]
    Keywords
    nitrogen fertiliser; phosphorus soils
    Date
    2012
    Type
    Conference Contribution - Published (Conference Paper)
    Collections
    • Department of Agricultural Sciences [1445]
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    Copyright © The Authors and New Zealand Grassland Association.
    Citation
    Dodd, R. J., McDowell, R. W. & Condron, L. M. (2012). Using nitrogen fertiliser to decrease phosphorus loss from high phosphorus soils. In Proceedings of the New Zealand Grassland Association, 74, 121-126.
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