Rooted cuttings were grown in controlled environment cabinets at two daily light totals (63 and 125 J cm −2 day −1 ) with the light intensity constant throughout the day or in steps giving the same daily light total Plants were sampled frequently over a period of 83 days by which time they were in full flower. A comparison of the various growth measures derived from the primary data on leaf area, fresh and dry weight of the plant and its parts, and morphological and floral characteristics, revealed only negligibly small differences between results for constant and stepped regimes The results for the constant regimes were compared with other experiments earned out simultaneously in order to indicate the reproducibility of growth in independent cabinets having nominally the same conditions
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HUGHES et al. (1971) studied this question.
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