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CONTROL OF EVAPORATIVE DEMAND ON TRANSPIRING PLANTS II. CONTROL ALGORITHM AND PERFORMANCE

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type:紀要論文

type:Original Contribution

The control of evaporative demand (ED_A) was performed on the basis of the control algorithm developed. ED_A can be controlled by manipulating environmental factors of short wave irradiance, air temperature, humidity and wind velocity. In this experiment, relative humidity (RH) was manipulated in consideration of the higher sensitivity of ED_A to RH. In a natural light growth chamber, ED_A was controlled at a desired value of 73mg/m^2/s with an accuracy of ±4mg/m^2/s by manipulating RH in the range from 45 to 90% according to diurnal variation in solar irradiance on a fair day. Under higher solar irradiance around the fair midday, the ED_A control brought smaller water loss and higher stomatal conductance in a cucumber plant as compared with those under the ED_A-uncontrolled condition where ED_A was increased to the higher level with solar irradiance under a constant RH of 70%. Thus, it can be conceivable that the developed algorithm is useful for optimalizing plant water relations.

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  • BIOTRONICS

    BIOTRONICS 21 61-68, 1992-12

    Biotron Institute, Kyushu University

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