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Research article - Peer-reviewed, 2004

Predicting the effect of irradiance and temperature on. the flower diameter of greenhouse grown Chrysanthemum

Nothnagl M, Kosiba A, Larsen RU


A model was developed describing the influence of irradiance and temperature in the greenhouse on the size of Chrysanthemum flowers. In the model, flower diameter increment was related to a development index ranging from zero (start of SD) to unity (anthesis). The growth of the visible flower was divided into two different phases. In the first phase a linear function described the growth and development of the early visible flower bud, while the second phase, representing the opening process of the flower was best described with a monomolecular growth function. The effect of the climate on the two growth phases was modelled using empirical climate functions. Data, collected from a light and a temperature experiment, showed that low light integrals and temperatures above 20degreesC had a retarding effect on flower growth. When the model was fitted to the observed data from the light experiment the R-2-values varied from 0.999 to 0.965. Even the simulated diameter values matched the observed values from the temperature experiment well (R-2-values from 0.998 to 0.966). When validated on independently collected data from two trials, the model could simulate the variations in the data with R-2-values of 0.993 and 0.997. (C) 2003 Elsevier B.V. All rights reserved


Chrysanthemum indicum; Chrysanthemum morifolium; Flower size; growth model; greenhouse climate; Dendranthema

Published in

Scientia Horticulturae
2004, Volume: 99, number: 3-4, pages: 319-329

      SLU Authors

    • Nothnagl, Margit

      • Department of Crop Science, Swedish University of Agricultural Sciences
      • Kosiba Held, Andrea

        • Department of Crop Science, Swedish University of Agricultural Sciences
        • Larsen, Rolf Uno

          • Department of Crop Science, Swedish University of Agricultural Sciences

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