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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. 569-576
    Proceedings of the Second International Turfgrass Research Conference

    Eliot C. Roberts (ed.)

    ISBN: 978-0-89118-573-4


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Growth control for highway turf1

  1. R.C. Wakefield and
  2. A.T. Dore


Growth retardants for highway turf were tested over a 3-year period to evaluate the response of Kentucky bluegrass (Poa pratensis), red fescue (Festuca rubra), and Colonial bentgrass (Agrostis tenuis Sibth.) to applications of maleic hydrazide [6-hydroxy-3(2H)-pyridazione], chlorflurenol (2-chloro-9-hydroxy-fluorene-9-carboxylic acid), a combination of maleic hydrazide and chlorflurenol, and Sustar (3-trifluoromethylsulfonamido). Other variables included nitrogen applications to the turf and height of cut. Top growth and root growth were evaluated in order to determine the extent to which growth retardants combined with management factors could practically and safely reduce the mowing requirement of roadside turf.

All retardants significantly reduced vegetative and seedhead top growth. However there was a range of effectiveness depending on material used, rates of application, and the species of grass. Some temporary discoloration of vegetation occurred with some materials but was not considered serious. Root growth was significantly retarded by all materials; the effect closely paralleled that of reducing top growth.

Growth of red fescue was more effectively retarded than Kentucky bluegrass and was less subject to discoloration.

Growth control was much more effective at a mowing height of 10 cm than at 6.3 cm. Supplemental nitrogen was useful in overcoming the discoloration caused by growth retardants by improving color and by increasing the density of growth. Additional index words: Growth retardant, Growth inhibitor, Poa pratensis, Festuca rubra.

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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