Comparison of classical models for evaluating the heat requirements of olive (Olea europeae L.) in Portugal

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Ribeiro, H (Author) Other; Cunha, M (Author) FCUP; Abreu, I (Author) FCUP

Journal

Title: Journal of Integrative Plant Biology

Vol. 48

Pages: 664-671

ISSN: 1672-9072

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 11 Citations

Scientific classification

FOS: Natural sciences > Biological sciences

Other information

Authenticus ID: P-004-KH1

DOI: 10.1111/j.1744-7909.2006.00269.x

Abstract (EN): The aim of the present study was to compare the accuracy and reproducibility of six statistical models for the calculation of olive (Olea europeae L.) heat requirements to trigger the onset of flowering in three Portuguese regions: Reguengos de Monsaraz, Valenca do Douro, and Braga. Other aims were to ascertain the date on which the heat-accumulation period started and the threshold temperatures above which the development of reproductive structures starts in olives. The starting and peak dates for the regional O. europeae flowering season were estimated by monitoring airborne pollen from 1998 to 2004 using "Cour" type samplers. The threshold temperature values calculated for the three regions were very similar (9.0 degrees C for Valenca do Douro, 9.2 degrees C for Reguengos de Monsaraz, and 9.7 degrees C for Braga). The accumulated daily mean temperature model had less interannual and inter-regional variation, showing best predictive results for 2004, with absolute differences between the observed and predicted dates of 4 d in Reguengos de Monsaraz and 2 d in Valenca do Douro and Braga for the onset of flowering date and of 2 d in Reguengos de Monsaraz, 7 d in Valenca do Douro, and 4 d in Braga for peak flowering dates. This model was the most accurate, reproducible, and operational to calculate heat requirements for olives to flower, with an average mean temperature accumulation of 1 446 degrees C in Reguengos, 1 642 degrees C in Valenca do Douro, and 1 703 degrees C in Braga to reach the onset of flowering. The best initial date for this accumulation was 1 January.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8