{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T15:28:42Z","timestamp":1759159722073},"reference-count":55,"publisher":"Cambridge University Press (CUP)","issue":"7","license":[{"start":{"date-parts":[[2018,10,24]],"date-time":"2018-10-24T00:00:00Z","timestamp":1540339200000},"content-version":"unspecified","delay-in-days":53,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":["www.cambridge.org"],"crossmark-restriction":true},"short-container-title":["J. Agric. Sci."],"published-print":{"date-parts":[[2018,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Phenological models for predicting the grapevine flowering were tested using phenological data of 15 grape varieties collected between 1990 and 2014 in Vinhos Verdes and Lisbon Portuguese wine regions. Three models were tested: Spring Warming (Growing Degree Days \u2013 GDD model), Spring Warming modified using a triangular function \u2013 GDD triangular and UniFORC model, which considers an exponential response curve to temperature. Model estimation was performed using data on two grape varieties (Loureiro and Fern\u00e3o Pires), present in both regions. Three dates were tested for the beginning of heat unit accumulation (<jats:italic>t<\/jats:italic><jats:sub>0<\/jats:sub>date): budburst, 1 January and 1 September. The best overall date was budburst. Furthermore, for each model parameter, an intermediate range of values common for the studied regions was estimated and further optimized to obtain one model that could be used for a diverse range of grape varieties in both wine regions. External validation was performed using an independent data set from 13 grape varieties (seven red and six white), different from the two used in the estimation step. The results showed a high coefficient of determination (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>: 0.59\u20130.89), low Root Mean Square Error (RMSE: 3\u20137 days) and Mean Absolute Deviation (MAD: 2\u20136 days) between predicted and observed values. The UniFORC model overall performed slightly better than the two GDD models, presenting higher<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>(0.75) and lower RMSE (4.55) and MAD (3.60). The developed phenological models presented good accuracy when applied to several varieties in different regions and can be used as a predictor tool of flowering date in Portugal.<\/jats:p>","DOI":"10.1017\/s0021859618000850","type":"journal-article","created":{"date-parts":[[2018,10,24]],"date-time":"2018-10-24T09:05:28Z","timestamp":1540371928000},"page":"865-876","update-policy":"http:\/\/dx.doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":12,"title":["Predicting the flowering date of Portuguese grapevine varieties using temperature-based phenological models: a multi-site approach"],"prefix":"10.1017","volume":"156","author":[{"given":"Mafalda","family":"Reis Pereira","sequence":"first","affiliation":[]},{"given":"Helena","family":"Ribeiro","sequence":"additional","affiliation":[]},{"given":"Ilda","family":"Abreu","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9","family":"Eiras-Dias","sequence":"additional","affiliation":[]},{"given":"Teresa","family":"Mota","sequence":"additional","affiliation":[]},{"given":"M\u00e1rio","family":"Cunha","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2018,10,24]]},"reference":[{"key":"S0021859618000850_ref50","doi-asserted-by":"crossref","first-page":"207","DOI":"10.5344\/ajev.2004.55.3.207","article-title":"Influence of climate, soil, and cultivar on terroir","volume":"55","author":"van Leeuwen","year":"2004","journal-title":"American Journal of Enology and Viticulture"},{"key":"S0021859618000850_ref45","doi-asserted-by":"publisher","DOI":"10.1017\/S0021859615000453"},{"key":"S0021859618000850_ref6","first-page":"49","article-title":"Signals regulating dormancy in vegetative buds","volume":"1","author":"Chaos","year":"2007","journal-title":"International Journal of Plant Developmental Biology"},{"key":"S0021859618000850_ref53","doi-asserted-by":"crossref","first-page":"283","DOI":"10.5344\/ajev.1985.36.4.283","article-title":"Validation of a model for the growth and development of the Thompson seedless grapevine. 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