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Transpiration of container-grown Acer rubrum under conditions of high evaporative demand



Transpiration of container-grown Acer rubrum under conditions of high evaporative demand



Applied engineering in agriculture 15(5): 553-557



This study was preliminary to developing feed-forward computer control algorithms to irrigate Acer Rubrum (Red Maple) trees in proportion to predicted transpiration. Transpiration rates of Acer Rubrum and related climate variables were measured continuously in a very high evaporative demand greenhouse environment and compared independently to solar radiation and vapor pressure deficit (VPD). Measured transpiration rates were further compared to predicted transpiration based on the combination equation. Based on regression analyses and the coefficient of determination (R(2)), the single variable VPD predicted transpiration equally as well as the combination model with an R squared value for both equal to 0.861. Meanwhile, using the single variable solar radiation to predict transpiration resulted in an R squared value of 0.652.

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