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Determining Transferability of Solar Radiation Data¹

Solar radiation is the primary driver for most process level crop models, and because of the lack of solar radiation reporting stations available to the modeller, it is sometimes necessary to transfer data from the nearest reporting station for use at the desired locale. The reason for this investigation was to determine statistically if solar radiation collected at three different locales in Mississippi could be used interchangeably. The statistical procedure, spectral analysis, was used to examine the data collected at the three sites with the result that, statistically, data collected at one site could not be used at another site. Further work is needed in this area to determine the maximum distance solar radiation might be transferable.

Key Words: Spectral analysis • Power spectrum • Crop models • Modelling

² Research associate, Agronomy Dep., Mississippi State Univ., Mississippi State, MS, and electronics engineer, USDA-ARS, Crop Simulation Res. Unit, Mississippi State, MS, respectively.

Received for publication October 7, 1985.