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The effects of day and night temperature on Chrysanthemum morifolium: investigating the safe limits for temperature integration

By S. R. (Steven R.) Adams, V. M. Valdes and D. (Debbie) Fuller

Abstract

The impact of day and night temperatures on pot chrysanthemum (cultivars ‘Covington’ and ‘Irvine’) was assessed by exposing cuttings, stuck in weeks 39, 44, and 49, to different temperature regimes in short-days. Glasshouse heating setpoints of 12°, 15°, 18°, and 21°C, were used during the day, with venting at 2°C above these set-points. Night temperatures were then automatically manipulated to ensure that all of the treatments achieved similar mean diurnal temperatures. Plants were grown according to commercial practice and the experiment was repeated over 2 years. Increasing the day temperature from approx. 19°C to 21°C, and compensating by reducing the night temperature, did not have a significant impact on flowering time, although plant height was increased.This suggests that a temperature integration strategy which involves higher vent temperatures, and exploiting solar gain to give higher than normal day temperatures, should have minimal impact on crop scheduling. However, lowering the day-time temperature to approx. 16°C, and compensating with a warmer night, delayed flowering by up to 2 weeks. Therefore, a strategy whereby, in Winter, more heat is added at night under a thermally-efficient blackout screen may result in flowering delays.Transfers between the temperature regimes showed that the flowering delays were proportional to the amount of time spent in a low day-time temperature regime. Plants flowered at the same time, irrespective of whether they were transferred on a 1-, 2-, or 4-week cycle

Topics: SB
Publisher: Headley Brothers Ltd.
Year: 2009
OAI identifier: oai:wrap.warwick.ac.uk:2268

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  1. (1993). A re-analysis of the effects of temperature and irradiance on time to flowering in chrysanthemum (Dendranthema grandiflora).
  2. (1989). Analysis of components controlling early flowering of chrysanthemum at low temperature. doi
  3. (1954). Chrysanthemum temperature study. C. The effect of night, day and mean temperature upon the flowering of Chrysanthemum morifolium.
  4. (1989). Development rate during four phases of chrysanthemum growth as determined by preceding and prevailing temperatures.
  5. (2002). Effect of day and night temperature on internode and stem length in chrysanthemum: is everything explained by DIF? doi
  6. (1987). Effects of day and night temperature on growth and flowering of chrysanthemum.
  7. (2003). Energy-saving strategies.
  8. (1972). Flower formation in Chrysanthemum morifolium: the influence of light level. doi
  9. (2001). Influence of greenhouse climate and plant density on external quality of chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura): First steps towards a quality model.
  10. (1994). Predicting flower development in greenhouse grown chrysanthemum. doi
  11. (1978). Selection for wide temperature adaptation in Chrysanthemum morifolium (Ramat.) Hemsl.
  12. (2006). Temperature response of photosynthesis and internal conductance to CO2: results from two independent approaches. doi
  13. (1998). The effect of temperature on inflorescence initiation and subsequent development in chrysanthemum cv. ‘Snowdon’ (Chrysanthemum x morifolium Ramat.). Scientia Horticulturae, doi
  14. (2006). The effects of averaging sub- and supraoptimal temperatures on the flowering of Chrysanthemum morifolium.
  15. (1981). The effects of day and night temperature on flower initiation and development in chrysanthemum.
  16. (1997). The effects of temperature, photoperiod and light integral on the time to flowering of pansy cv. Universal Violet (Viola x wittrockiana Gams.). doi
  17. (2006). The influence of temperature on growth and development of chrysanthemum cultivars: a review.

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