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This article in CS

  1. Vol. 36 No. 4, p. 997-999
     
    Received: May 1, 1995
    Published: July, 1996


    * Corresponding author(s): rgaussoi@unlinfo.unl.edu
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doi:10.2135/cropsci1996.0011183X0036000400030x

Basal Growth Temperatures and Growth Rate Constants of Warm-Season Turfgrass Species

  1. J. B. Unruh,
  2. R. E. Gaussoin  and
  3. S. C. Wiest
  1. D ep. of Horticulture, Iowa State Univ., Ames, IA 50011
    D ep. of Horticulture, Univ. of Nebraska-Lincoln, Lincoln, NE 68583-0724
    D ep. of Horticulture, Forestry and Rec. Res., Kansas State Univ., Manhattan, KS 66506

Abstract

Abstract

Degree-day modeling applications in turfgrass management have recently seen increased interest. The predictive capacity of any degree day model is dependent on an accurate determination of the basal growth temperatures for the species under consideration. The objective of this study was to determine basal growth temperatures and growth rate constants for eight warm season turfgrasses (five species). Sprigs from bermudagrass [Cynodon dactylon (L.) Pers. cv. Arizona Common and C. dactylon lc C. transvaalensis Burtt Davey cv. Midiron], buffalograss [Buchloë dactyloides (Nutt.) Engelm. cv. Kansas Common and Texoka], zoysiagrass (Zoysia japonica Steudel cv. Meyer), St. Augustinegrass [Stenotaphrum secundatum (Walter) Kuntze cv. Raleigh and Floratam], and centipedegrass [Eremochloa ophiuroides (Munro) Hackel, cv. Common] were grown at temperatures ranging from 5 to 30°C in a controlled environment chamber under 14-h photoperiods. Chamber temperature was decreased in a step-wise fashion to the next temperature after two leaves were fully expanded. Leaf growth rates at each temperature were calculated and expressed as millimeters per day. Base temperature and growth rate constants for each turfgrass were calculated with segmented nonlinear regression analysis. Base temperatures for the eight tested cultivars ranged from 0 to 13°C. Interspecific and intraspecific differences for basal growth temperature were found, indicating that degree-day model application accuracy is dependent on proper determination of target species and cultivar basal growth temperature.

Joint Contribution of Kansas Agric. Exp. Stn. Contribution No. 95-393-J and Nebraska Agric. Res. Div. Journal Series No. 11054.

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