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    The effect of nitrogen on the yield of four pasture grass species

    Wilson, Nick
    Abstract
    This research examined the morpho-physiological attributes of four pasture grass species under two nitrogen (N) treatments. The experiment was a split plot design with main plots of N+ and N- and subplots of cocksfoot (Dactylisglomerata), pasture brome (Bromusvaldivianus), perennial ryegrass (Loliumperenne) and tall fescue (Festucaarundinacea). Leaf length, leaf area and specific leaf area (SLA) decreased by 30%, 36% and 7% under N-, whereas leaf dryness (percentage dry matter) increased by 18%. Total accumulated aboveground plant dry matter (DM) yield decreased by 13% in response to the N- treatment. Chlorophyll levels, measured as SPAD units, predicted yield under N+ conditions which was also reflected in the leaf length, leaf area and SLA measurements. The findings also suggest that species with higher green DM compensated for external N reduction by utilising higher internal available N within the plant. Brome and cocksfoot, and to a lesser degree tall fescue, showed superior morphological leaf attributes under mixed N-availability and can be proposed as suitable alternatives in dryland and low nitrogen farming systems as an alternative to perennial ryegrasses.... [Show full abstract]
    Keywords
    nitrogen; perennial ryegrass; brome; cocksfoot; Bromus valdivianus; Dactylis glomerata; Lolium perenne; Festuca arundinacea; dry matter; leaf morphology; SPAD meter
    Fields of Research
    07 Agricultural and Veterinary Sciences; 070303 Crop and Pasture Biochemistry and Physiology
    Date
    2017-11-14
    Type
    Dissertation
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    • Department of Agricultural Sciences [1568]
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