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This article in AJ

  1. Vol. 80 No. 5, p. 850-852
    Received: Dec 9, 1987

    * Corresponding author(s):


Use of Growing Degree Days to Project Sample Dates for Cereal Crops

  1. Betty Klepper ,
  2. R. W. Rickman,
  3. J. F. Zuzel and
  4. S. E. Waldman
  1. USDA-ARS, Columbia Plateau Conserv. Res. Ctr., P.O. Box 370, Pendleton, OR 97801.



Timely field sampling of a developing crop requires careful organization of laboratory space, equipment, and personnel to maximize efficiency. This paper demonstrates how historical temperature data sets, planting dates, and plot site elevation and location can be used to project expected developmental stage for winter wheat (Triticum aestivum L.) plants at any site in the Pacific Northwest dryland wheat-growing areas. Historical average temperature data from long-term weather station records for over 50 sites in the Oregon-Washington-Idaho dryland cereal production areas are stored on a computer. A program selects the weather station site nearest to the plot site on the basis of latitude, longitude, and altitude. Average daily maximum and minimum temperatures from the weather station are used to generate daily growing degree days for the plot site. Growing degree days are used to predict crop development. Projections can be made of either the expected date for a particular developmental stage or the expected degree days for any given date. Projections are used to schedule sample dates.

Joint contribution of the USDA-ARS and Oregon State Univ. Oregon State Univ. Agric. Exp. Stn. Tech. Paper no. 8386.

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