Articles
GROWTH REGULATION OF BEDDING PLANTS BY REVERSED DAY/NIGHT TEMPERATURE ONLY?
Article number
305_4
Pages
37 – 44
Language
Abstract
Two experiments were carried out in glasshouse compartments in order to investigate the growth regulating potentials of reversed day/night temperature regimes (13/21, 16/18°C) in comparison with 18/16°C as an alternative for chemical growth control of bedding plants grown at different watering methods (ebb/flood, hand watering). Plant height was reduced in all investigated crops by reversed day/night temperatures in the first experiment (5 February-26 April). Elongation of Impatiens ‘Impuls’ was reduced sufficiently with the 13/21°C day/night temperature regime.
To obtain an acceptable plant height, chemical growth control was still needed for Pelargonium ‘Pulsar Red’ and Fuchsia ‘Dollar Princess’ grown at reversed day/night regimes, but the amount was reduced by 30% compared to the 18/16°C treatment for Pelargonium. Low moisture level (by means of hand watering) was more effective in reducing plant height of Petunia ‘Blue Flash’ than reversed day/night temperature.
In the second experiment (23 April-14 June) plant height was not affected by reversed day/night temperature regimes.
In this experiment, temperature differences were realized in the early morning, but it was difficult to maintain low temperatures during the rest of the day.
Plant height and dry weight were in most cases affected in the same way by temperature regime and watering method.
Ebb/flood watering improved homogeneity compared with hand watering, but increased in some treatments the amount of growth regulators.
To obtain an acceptable plant height, chemical growth control was still needed for Pelargonium ‘Pulsar Red’ and Fuchsia ‘Dollar Princess’ grown at reversed day/night regimes, but the amount was reduced by 30% compared to the 18/16°C treatment for Pelargonium. Low moisture level (by means of hand watering) was more effective in reducing plant height of Petunia ‘Blue Flash’ than reversed day/night temperature.
In the second experiment (23 April-14 June) plant height was not affected by reversed day/night temperature regimes.
In this experiment, temperature differences were realized in the early morning, but it was difficult to maintain low temperatures during the rest of the day.
Plant height and dry weight were in most cases affected in the same way by temperature regime and watering method.
Ebb/flood watering improved homogeneity compared with hand watering, but increased in some treatments the amount of growth regulators.
Publication
Authors
J. Vogelezang, L. Cuijpers, M.Th. de Graaf-van der Zande
Keywords
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