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This article in AJ

  1. Vol. 76 No. 5, p. 756-758
     
    Received: Sept 15, 1983
    Published: Sept, 1984


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doi:10.2134/agronj1984.00021962007600050012x

Annual Bluegrass Seedhead Emergence as Predicted by Degree-Day Accumulation1

  1. T. K. Danneberger and
  2. J. M. Vargas2

Abstract

Abstract

Seedhead production of annual bluegrass (Poa annua L.) during the spring reduces annual bluegrass root production and disrupts the aesthetic and playing qualities of the turf. A method of predicting when annual bluegrass seedheads visually emerge through maximum production would be a benefit to turf managers in that management practices such as vertical mowing and core cultivation could be suitably adjusted. A model to predict the number of seedheads from visual emergence through maximum production for a perennial annual bluegrass turf was developed from three field locations in Michigan. The proposed model is seedhead no. = −6249.4 + 41.099 (DD) − 0.08573 DD2 + 0.0000575 DD3 where DD = degree-day accumulation above 286 K beginning April (R2 = 0.65).

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