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A system for variable-value control of air temperature by using natural light intensity as a feedback signal was newly developed, and growth of cucumber plants (Cucumis sativus L.) under the variable-...value control was examined. In the variable-value control, the set value of air temperature increased quadratically with natural light intensity in the range of 18℃ to 32℃. Growth of mature leaves and dry matter accumulation were promoted under the variable-value control, but rapid increases in stem length, leaf area per plant and number of leaves were found under the constant-value control (25℃). Thus, cucumber plant growth appeared healthier under the variable-value control of air temperature, while it became somewhat succulent under the constant-value control of air temperature.続きを見る
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