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Book: Proceedings of the Second International Turfgrass Research Conference
Published by: American Society of Agronomy, Crop Science Society of America



  1.  p. 112-119
    Proceedings of the Second International Turfgrass Research Conference

    Eliot C. Roberts (ed.)

    ISBN: 978-0-89118-573-4


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Influence of fall nitrogenous fertilization on the carbohydrates of Kentucky bluegrass1

  1. D. T. Duff


Ten grams of nitrogen per square meter were applied October 1 and 15, November 1 and 15, December 1 and 15 to separate plots. Sample tissue was removed from the plots at 2-week intervals throughout the autumn, winter, and spring. Basal culm, lower leaf sheath, and apical meristem tissue were analyzed for carbohydrate content after extraction with a graded ethanol-water series.

There was a rapid increase in all soluble carbohydrate components studied during November, the period of hardening in Rhode Island, followed by a more gradual increase during winter. The levels of total long-chain and short-chain carbohydrates found appeared to be adequate for energy to support new growth at the end of the dormant season regardless of the time of N application the previous autumn. The levels of short-chain polymers were little effected by N treatments. The amount of long-chain polymers may account for reduced cold tolerance caused by fall nitrogen application found in a companion study. Additional index words: Carbohydrate polymers, Cold tolerance, Acclimation, Poa pratensis.

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Copyright © 1974. Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA