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Early spring ag-weather bulletin (a guide to forecasters in judging weather impact on growth environments and farm operations)
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1988
[PDF-3.63 MB]
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Description:Lengthening periods of daylight combined with seasonal intrusions of warmer air are beginning to trigger growth responses in overwintering crops as the late winter period gives way to early spring. A stepwise process of early growth and development follows the alternating pattern of warm and cool air masses characteristic of the season. Each successive warming cycle provides more impetus for movement of buds and greening of grasses. Attempts to develop an objective standard to relate this growth response to prevailing weather conditions have provided a variety of growing degree day schemes for calculation of accumulated heat units above a given threshold temperature. The thresholds vary with the type of crop, but two of the most commonly used are 40 and 50 degrees. These apply to cool season (winter grains) and warm season (corn, soybeans) crops, respectively. Thus, a day with mean temperature of 60 degrees (maximum of 70 and minimum of 50, for example) would yield 20 growing degree days calculated at base 40 and 10 at base 50. At southern locations where cotton is grown, a base 60 degree day system is employed.
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Rights Information:Public domain
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