Articles
EFFECTS OF TEMPERATURE AND PHOTOPERIOD ON GROWTH OF TWO LEUCOSPERMUM HYBRIDS
Article number
1000_49
Pages
361 – 365
Language
English
Abstract
The aim of this study was to assess the growth of Leucospermum Succession II (L. cordifolium × L. lineare) and L. Tango (L. lineare × L. glabrum) cultivated in La Palma Island (Canary Islands). During the 2008 growing season, stem length measurements were weekly recorded in eight farms, in a range of altitudes from 600 to 867 m, located in most of the production areas of the island.
These data were related with environmental conditions to assess if thermal (the growing degree days, the single triangle and the single sine) and photo-thermal models could be used to predict the end of the vegetative growth period of these cultivars.
Base temperatures, photo-thermal and thermal units were calculated for both proteas.
The model best adapted to Succession II was the photothermal one as it showed the lowest coefficient of variation (7.42%), while for Tango the lowest coefficient of variation (7.83%) was obtained using the growing degree days model.
However, all models gave a good fit to the observed stem length data of both cultivars, although the coefficients of determination of the photo-thermal model were slightly higher than those of the thermal one.
In conclusion, both models can be used to predict the date of the end of the vegetative growth of both Proteaceae.
These data were related with environmental conditions to assess if thermal (the growing degree days, the single triangle and the single sine) and photo-thermal models could be used to predict the end of the vegetative growth period of these cultivars.
Base temperatures, photo-thermal and thermal units were calculated for both proteas.
The model best adapted to Succession II was the photothermal one as it showed the lowest coefficient of variation (7.42%), while for Tango the lowest coefficient of variation (7.83%) was obtained using the growing degree days model.
However, all models gave a good fit to the observed stem length data of both cultivars, although the coefficients of determination of the photo-thermal model were slightly higher than those of the thermal one.
In conclusion, both models can be used to predict the date of the end of the vegetative growth of both Proteaceae.
Authors
S. de Paz-González, J.A. Rodríguez-Pérez, F.N. Molina-González, E. Huertas-López
Keywords
photo-thermal models, photo-thermal units, Proteaceae, stem growth, thermal units, thermal models
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