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Evapotranspiration Rate Measurement by Energy-balance Equation in a Single-span Greenhouse

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  074020.(doi:10.13031/2013.23253)
Authors:   Tadashi Takakura, Cheri Kubota, Sadanori Sase, Makio Hayashi, Masahisa Ishii, Kotaro Takayama, Hiroshige Nishina, Kenji Kurata, Gene A Giacomelli
Keywords:   greenhouse, evapotranspiration, Penman-Monteith, energy balance

An energy balance equation was used to estimate evapotranspiration in a greenhouse, and an instrument for this purpose was developed. It was found that the present method is simpler than that using the Penman-Monteith equation and the estimated values by this method were in good agreement with measured data. It is also reported that normal radiation sensor measurements on a horizontal surface are not adequate for measuring radiation received by a plant canopy in a greenhouse.

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