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Use of Growing Degree Days to Project Sample Dates for Cereal Crops
Author(s) -
Klepper Betty,
Rickman R. W.,
Zuzel J. F.,
Waldman S. E.
Publication year - 1988
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1988.00021962008000050034x
Subject(s) - growing degree day , sowing , longitude , latitude , environmental science , altitude (triangle) , crop , degree day , degree (music) , geography , weather station , elevation (ballistics) , agronomy , forestry , meteorology , biology , mathematics , physics , geometry , geodesy , acoustics
Abstract 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.