Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9488807 | Scientia Horticulturae | 2005 | 13 Pages |
Abstract
The influence of 24 h mean air temperature (18.3, 20.6, 23.9 and 25.8 °C) and photosynthetic photon flux (PPF; 0.6, 2.1, 3.7 and 4.7 mol mâ2 dâ1) on the growth cycles of vegetative growth in Ilex Ã meserveae ('Blue Princess' S.Y. Hu) was investigated. Plants propagated from top cuttings were grown in greenhouse compartments. The number of unfolded leaves was recorded continuously throughout the experiment. A modified sine function was fitted to collected data and the values for the amplitude and frequency of the growth curves were analysed. The sine function was tested as a method to evaluate the influence of climate on periodically flushing species. Both amplitude and frequency were significantly influenced by air temperature and PPF. The highest frequency of flushing was found at 23.9 °C and 3.7 mol mâ2 dâ1. The function resulted generally in a good fit to collected data with R2 values above 0.9. Growth curves of all individual plants were categorised with respect to their growth pattern as poor synchronisation within the treatments did not allow analysis of the mean values of the growth curves.
Keywords
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Life Sciences
Agricultural and Biological Sciences
Horticulture
Authors
Andrea Kosiba, Margit Nothnagl, Beatrix W. Alsanius, Rolf U. Larsen,