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    Nitrogen Mineralization from Brassica Cover Crops

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    No. of downloads: 2213

    Date
    2006-07-27
    Author
    Kremen, Amy
    Advisor
    Weil, Ray
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    Abstract
    The potential of forage radish (<em>Raphanus sativus</em> L.), rape (<em>Brassica napus</em> L.), and rye (<em>Secale cereale</em> L.) cover crops to capture residual nitrogen and then provide early season N to subsequent main crops via mineralization from their residues was compared. At four field experiments established in Maryland (2003-2005), N uptake by radish and rape equaled or exceeded that by rye. No differences in soil inorganic N due to cover crop type were observed during spring 2004. In spring 2005, greatest N release from forage radish residues (March-May) was followed by that from rape residues (May-June). Brassica decay significantly increased growth of immature corn and soybean plants. In a 48-day incubation study comparing N mineralization in fine and coarse textured soils from Brassica and rye root or shoot residues, N mineralization was greatest from forage radish and rape shoots. Compared with rye, the Brassica cover crops showed environmental and agronomic promise.
    URI
    http://hdl.handle.net/1903/3821
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    • Plant Science & Landscape Architecture Theses and Dissertations
    • UMD Theses and Dissertations

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