Articles
PHENOLOGICAL MODELING OF PEACH AND SWEET CHERRY: START DATES AND THRESHOLD TEMPERATURES FOR EACH PHENOPHASE
Article number
940_19
Pages
155 – 161
Language
English
Abstract
Modeling fruit tree phenological behavior allows an appropriate selection of cultivars for a particular area, and a better scheduling of cultural techniques.
Studies concerning heat requirements of different cultivars are valuable tools to avoid problems caused by lack of adaptation.
This work attempted to improve flowering time modeling in peach and sweet cherry by determining their best-performing start dates and temperature thresholds (Tb) for each phenophase, in order to model accurately bud development under the climatic conditions of different growing areas.
Three years of phenological data were collected in adult commercial orchards at the main peach and sweet cherry growing areas in Ebro and Guadiana Valleys (Spain). Data were collected on three peach (Big Top, OHenry and Andross) and three sweet cherry (Lapins, Sweet Heart and Sunburst) cultivars, with 10 (cherry) or 20 (peach) orchards per cultivar.
For each phenophase, heat requirement was calculated as the number of GDHs accumulated between each starting date evaluated and the date of occurrence for the phenophase.
The evaluated start dates ranged from 1 January to 5 February, at 5 day intervals, whereas temperature thresholds ranged from 0 to 15°C, at 1°C intervals.
Three methods, based on minimizing the prediction errors (absolute or root of the mean squares) or the coefficient of variation were tested.
Best Tb obtained differed considerably among methods, and mean absolute error method was the only method giving plausible Tb. The value of Tb differed considerably among species and phenophases, being higher for later ones.
Best start dates for heat accumulation were around 20-25 January in both species.
Studies concerning heat requirements of different cultivars are valuable tools to avoid problems caused by lack of adaptation.
This work attempted to improve flowering time modeling in peach and sweet cherry by determining their best-performing start dates and temperature thresholds (Tb) for each phenophase, in order to model accurately bud development under the climatic conditions of different growing areas.
Three years of phenological data were collected in adult commercial orchards at the main peach and sweet cherry growing areas in Ebro and Guadiana Valleys (Spain). Data were collected on three peach (Big Top, OHenry and Andross) and three sweet cherry (Lapins, Sweet Heart and Sunburst) cultivars, with 10 (cherry) or 20 (peach) orchards per cultivar.
For each phenophase, heat requirement was calculated as the number of GDHs accumulated between each starting date evaluated and the date of occurrence for the phenophase.
The evaluated start dates ranged from 1 January to 5 February, at 5 day intervals, whereas temperature thresholds ranged from 0 to 15°C, at 1°C intervals.
Three methods, based on minimizing the prediction errors (absolute or root of the mean squares) or the coefficient of variation were tested.
Best Tb obtained differed considerably among methods, and mean absolute error method was the only method giving plausible Tb. The value of Tb differed considerably among species and phenophases, being higher for later ones.
Best start dates for heat accumulation were around 20-25 January in both species.
Authors
C. Miranda, I. Urretavizcaya, M. Zaragüeta, L.G. Santesteban, J.B. Royo
Keywords
Prunus persica (L.) Batsch, Prunus avium (L.), phenology, growing degree hours, modelling
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