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    Berekening van de nitraatuitspoeling naar het grondwater met behulp van eenvoudige modellen

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    Authors
    Drecht G van
    Goossensen FR
    Hack-ten Broeke MJD
    Jansen EJ
    Steenvoorden JHAM
    Type
    Report
    Language
    nl
    
    Metadata
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    Title
    Berekening van de nitraatuitspoeling naar het grondwater met behulp van eenvoudige modellen
    Translated Title
    Computation of nitrate leaching to groundwater, using simple models
    Publiekssamenvatting
    Abstract niet beschikbaar
    Nine steady state nitrate leaching models have been tested. Predicted annual leaching rates have been compared with measured nitrate leaching of field experiments both statistically and visually (double mass). Five models give satisfactory results for grassland on sandy soil. No sufficient data are available to test the models for grassland on clayey soil. None of the teted models can predict the measured nitrate leaching from silage maize fields on sandy soil satisfactorily. All tested models underestimate the measured nitrate leaching rates from silge maize fields. This can be explained by the high mineralization rates of organic N in these fields that probably have contributed to the nitrate leaching. Scenario studies have been carried out for cut and grazed grassland, silage maize and arable land (crop rotation). In a situation of cut grassland on well drained sandy soil and a N-fertilization level of 400 kg.ha-1.a-1, five models, that gave satisfactory results in the test, show a wide range of computed nitrate leaching rates 953 to 172 kg.ha-1.a-1). However most models compute the same reduction of about 50% of nitrate leaching rates if the N-fertilization level is decreased to 300 kg. ha-1.a-1 and slurry is applied in spring by the method of injection instead of spreading.
    Sponsors
    LNV VROM VW
    URI
    http://hdl.handle.net/10029/259179
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