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    Responses of bahiagrass to nitrogen and defoliation

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    Author
    Hirata, M.
    Pakiding, W.
    Issue Date
    2003-11-01
    Keywords
    stolons
    Paspalum notatum
    Japan
    stress tolerance
    nitrogen fertilizers
    tillers
    application rates
    defoliation tolerance
    tiller survival
    lamina production
    stubble-stolon-root system
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    Citation
    Hirata, M., & Pakiding, W. (2003). Responses of bahiagrass to nitrogen and defoliation. Journal of Range Management, 56(6), 608-615.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643484
    DOI
    10.2307/4003935
    10.2458/azu_jrm_v56i6_hirata
    Additional Links
    https://rangelands.org/
    Abstract
    Pensacola bahiagrass (Paspalum notatum Flgge) swards pretreated with fertilizer nitrogen rates of 0 and 66-99 kg N ha-1 year-1 were exposed to repeated, severe defoliation (i.e., removal of all laminae) of every day (D1), every 2 days (D2), and every 4 days (D4). Responses of the grass were monitored in terms of tiller survival, lamina production and changes in the mass of the stubble-stolon-root system, in an effort to investigate the effects of nitrogen rate and defoliation frequency on defoliation tolerance, to examine differences in survival ability of tillers among tiller age cohorts, and to evaluate contribution of the stubble-stolon-root system to defoliation tolerance. With the progress of defoliation treatments over 12 weeks, the swards degraded with decreasing tiller density, lamina production, and mass of stubble and stolons. Defoliation tolerance in terms of tiller survival was influenced only by defoliation frequency (D1 = D2 < D4), with no significant effect of nitrogen fertilizer rate. There were no differences in survival ability of tillers among age cohorts formed before the defoliation treatments, suggesting that all tillers in bahiagrass were able to share energy and nutrients in connecting stolons under severe defoliation. It was confirmed that stolons play a key role in defoliation tolerance in bahiagrass as the main storage organ supporting aboveground parts, whereas the contribution of roots seems nil.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003935
    Scopus Count
    Collections
    Journal of Range Management, Volume 56, Number 6 (November 2003)

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