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Effect of Additional Early-Morning Heating Periods on the Growth and Yield of Cucumber and Heating Load  

Kwon Joon Kook (Protected Horticulture Experiment Station, NHRI, RDA)
Kang Nam Jun (Protected Horticulture Experiment Station, NHRI, RDA)
Lee Jae Han (Protected Horticulture Experiment Station, NHRI, RDA)
Kang Kyung Hee (Protected Horticulture Experiment Station, NHRI, RDA)
Choi Young Hah (Protected Horticulture Experiment Station, NHRI, RDA)
Publication Information
Journal of Bio-Environment Control / v.13, no.4, 2004 , pp. 245-250 More about this Journal
Abstract
To investigate the effect of early-morning heating periods on growth and yield of cucumber and heating load in a greenhouse cultivation, three additional heating periods (0, 1 and 2 hours) were compared to rise temperature from $12^{\circ}C\;to\;16^{\circ}C$ in the early-morning. Leaf temperature just before opening the thermal screen was $3.3^{\circ}C\;and\;4.1^{\circ}C$ higher in the 1 and 2 hour heating compared to that in the control (0 hour heating), respectively. Photosynthetic rate, conductance to $H_2O$ and transpiration rate of cucumber leaves were the highest in the 2 hour heating, and the lowest in the control. However. the difference between the 1 hour and 2 hour heating was not significant. Inorganic element content in cucumber leaves was not significant among the treatments of duration. Initial growth after planting of cucumber was greater in the 1 and 2 hour heating than that in the control. Yield increased by $11\%\;and\;15\%$ in the 1 hour and 2 hour heating compared to that in the control. respectively. Fuel consumption for heating increased by $12\%\;and\;22\%$ in the 1 hour and 2 hour heating compared to that in the control, respectively. Considering in the yield and fuel consumption for heating. 1 or 2 hours of early morning heating could be effective in temperature management for cucumber in a greenhouse cultivation.
Keywords
alternating temperature; cucumber; early-morning heating; greenhouse;
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