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    Quantification of phosphorus loss from soil to water.

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    Author
    Tunney, Hubert
    Coulter, B.S.
    Daly, Karen M.
    Kurz, Isabelle
    Coxon, Catherine E.
    Jeffrey, D.W.
    Mills, P.
    Kiely, Gerard
    Morgan, Ger
    Keyword
    Soil
    Phosphorus loss
    model
    Date
    2000-08-01
    
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    URI
    http://hdl.handle.net/11019/1415
    Citation
    Tunney, H., et al., Quantification of phosphorus loss from soil to water, End of Project Reports, Teagasc, 2000.
    Abstract
    The methods, results and discussion of the project are in five separate sections, 4.1) Phosphorus (P) export from agricultural grassland with overland flow and drainage water (Johnstown Castle); 4.2) Phosphorus export from farm in Dripsey catchment, Co. Cork (NMP); 4.3) Hydrometeorological aspects of farm in Dripsey Catchment (NMP); 4.4) Phosphorus desorption from Irish soils; 4.5) National phosphorus model. Most of the field and laboratory studies were carried out at Johnstown Castle, at UCC and the field site in the Dripsey catchment. The main aim of the project was to quantify the loss of P from soil to water where point source contributions from farmyards were not high. This involved the construction of hydrologically isolated field sites where the quantity of overland flow and the P concentrations for different runoff events from the fields could be measured. In addition, 90 soil samples representative of Irish soils were collected and analysed for the different factors influencing soil adsorption and desorption of P. These results, in addition to catchment data, were used as a first attempt at developing a model that could be used to help predict P loss from soil to water at a catchment scale. The study in the Dripsey was on a farm where water flow and P levels at two points in a stream were measured. The hydrometeorology at this site was also studied. At Johnstown Castle, three overland flow sites, of the order of one hectare each, and one subsurface flow site were studied for P loss to water.
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