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Quantifying plant responses of a tomato crop under a thermal screen

Kristof Vermeulen UGent, Tom De Swaef UGent, Kathy Steppe UGent, Annelies Christiaens UGent, Peter Bleyaert, Jan Dekock, Jean-Marie Aerts and Daniel Berckmans (2011) Acta Horticulturae. 893. p.831-838
abstract
Although thermal screens were already introduced more than twenty years ago in Western European glasshouse horticulture, growers were discouraged to install them in their glasshouse, since they were not able to quantify the crop's behaviour under a thermal screen. Nowadays, crop monitoring techniques have become commercially available, which might aid growers to support their decision to adapt their climate control set points once a thermal screen is installed. In this study, leaf temperature, stem diameter and sap flow measurements were performed on glasshouse tomato plants (Solanum lycopersicum L. 'Clothilde') grown inside two compartments in Beitem, Belgium during spring 2008. In one compartment, a movable and semi-transparent thermal screen was used during the night. Differences in leaf temperature between the two compartments were observed, which were mainly caused by differences in air temperature, although differences in radiative energy losses also had to be taken into account in the upper canopy layer in the case of cold nights. Based on these results, it is advised to include leaf temperature measurements in research concerning the effect of the use of thermal screens. Additionally, a reduced water uptake was observed in the morning when the screen was still closed, whereas during the evening hours no difference in water uptake could be revealed. However, when the thermal screen was closed in the evening, stem diameter measurements indicated that the internal water storage pools were restored more quickly under the screen. It is, however, acknowledged that these effects were only observed on sunny days. Consequently, in addition to leaf temperature measurements, sap flow and stem diameter measurements can provide growers and researchers useful feedback from the crop itself, when thermal screen application strategies are to be evaluated. As a general conclusion, it was stated that these crop monitoring techniques are imperative when novel techniques are to be introduced in glasshouse horticulture in a sustainable way.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
energy screen, crop monitoring, leaf temperature, sap flow, speaking plant, stem diameter
in
Acta Horticulturae
Acta Hortic.
editor
Martine Dorais
volume
893
issue title
International symposium on high technology for greenhouse systems : GreenSYS 2009
pages
831 - 838
publisher
International Society for Horticultural Science (ISHS)
place of publication
Leuven, Belgium
conference name
2009 International symposium on High Technology for Greenhouse Systems (GreenSYS 2009) : Global trends in greenhouse
conference location
Québec, QC, Canada
conference start
2009-06-14
conference end
2009-06-19
Web of Science type
Proceedings Paper
Web of Science id
000305385800091
ISSN
0567-7572
ISBN
9789066050471
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1922795
handle
http://hdl.handle.net/1854/LU-1922795
alternative location
http://www.actahort.org/books/893/893_91.htm
date created
2011-10-07 14:12:37
date last changed
2012-09-14 13:45:39
@inproceedings{1922795,
  abstract     = {Although thermal screens were already introduced more than twenty years ago in Western European glasshouse horticulture, growers were discouraged to install them in their glasshouse, since they were not able to quantify the crop's behaviour under a thermal screen. Nowadays, crop monitoring techniques have become commercially available, which might aid growers to support their decision to adapt their climate control set points once a thermal screen is installed. In this study, leaf temperature, stem diameter and sap flow measurements were performed on glasshouse tomato plants (Solanum lycopersicum L. 'Clothilde') grown inside two compartments in Beitem, Belgium during spring 2008. In one compartment, a movable and semi-transparent thermal screen was used during the night. Differences in leaf temperature between the two compartments were observed, which were mainly caused by differences in air temperature, although differences in radiative energy losses also had to be taken into account in the upper canopy layer in the case of cold nights. Based on these results, it is advised to include leaf temperature measurements in research concerning the effect of the use of thermal screens. Additionally, a reduced water uptake was observed in the morning when the screen was still closed, whereas during the evening hours no difference in water uptake could be revealed. However, when the thermal screen was closed in the evening, stem diameter measurements indicated that the internal water storage pools were restored more quickly under the screen. It is, however, acknowledged that these effects were only observed on sunny days. Consequently, in addition to leaf temperature measurements, sap flow and stem diameter measurements can provide growers and researchers useful feedback from the crop itself, when thermal screen application strategies are to be evaluated. As a general conclusion, it was stated that these crop monitoring techniques are imperative when novel techniques are to be introduced in glasshouse horticulture in a sustainable way.},
  author       = {Vermeulen, Kristof and De Swaef, Tom and Steppe, Kathy and Christiaens, Annelies and Bleyaert, Peter  and Dekock, Jan and Aerts, Jean-Marie and Berckmans, Daniel},
  booktitle    = {Acta Horticulturae},
  editor       = {Dorais, Martine},
  isbn         = {9789066050471},
  issn         = {0567-7572},
  keyword      = {energy screen,crop monitoring,leaf temperature,sap flow,speaking plant,stem diameter},
  language     = {eng},
  location     = {Qu{\'e}bec, QC, Canada},
  pages        = {831--838},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Quantifying plant responses of a tomato crop under a thermal screen},
  url          = {http://www.actahort.org/books/893/893\_91.htm},
  volume       = {893},
  year         = {2011},
}

Chicago
Vermeulen, Kristof, Tom De Swaef, Kathy Steppe, Annelies Christiaens, Peter Bleyaert, Jan Dekock, Jean-Marie Aerts, and Daniel Berckmans. 2011. “Quantifying Plant Responses of a Tomato Crop Under a Thermal Screen.” In Acta Horticulturae, ed. Martine Dorais, 893:831–838. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Vermeulen, K., De Swaef, T., Steppe, K., Christiaens, A., Bleyaert, P., Dekock, J., Aerts, J.-M., et al. (2011). Quantifying plant responses of a tomato crop under a thermal screen. In M. Dorais (Ed.), Acta Horticulturae (Vol. 893, pp. 831–838). Presented at the 2009 International symposium on High Technology for Greenhouse Systems (GreenSYS 2009) : Global trends in greenhouse, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Vermeulen K, De Swaef T, Steppe K, Christiaens A, Bleyaert P, Dekock J, et al. Quantifying plant responses of a tomato crop under a thermal screen. In: Dorais M, editor. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2011. p. 831–8.
MLA
Vermeulen, Kristof, Tom De Swaef, Kathy Steppe, et al. “Quantifying Plant Responses of a Tomato Crop Under a Thermal Screen.” Acta Horticulturae. Ed. Martine Dorais. Vol. 893. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2011. 831–838. Print.