A Statistical Method of Determining Chill Unit and Growing Degree Hour Requirements for Deciduous Fruit Trees1

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Abstract
Dates of rest completion are rarely available for determining the chill unit and growing degree hour requirements of deciduous fruit trees. A statistical process has been developed which permits these constants to be determined from temperature data and dates of full bloom. Bloom dates calculated from the model using the statistically derived constants compare favorably with observed dates of full bloom.

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