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  • Author or Editor: Alice J. McArdle x
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The reduction of the minimum temperature during the latter part of the dark period as a means of energy conservation was studied for 3 consecutive years with greenhouse roses. A warm temperature during the early part of the dark period was more promotive of growth than at subsequent or continuing portions of the dark period. The most rapid bloom development in the first and 3rd years’ trials was at the continuous warm night temperature of 17°C. During the 2nd year, the greatest production of blooms was also at the continuous minimum night temperature of 17°, but, in the 3rd year, a reduction in the minimum night temperature to 9° from 0100 to 0800 hr did not reduce production below that at a continuous 17° minimum. Split night temperatures did not affect the quality of cut roses when compared to a continuous minimum of 17°.

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