03090naa a2200289 a 450000100080000000500110000800800410001902200140006002400330007410000180010724501020012526000090022750004900023652017240072665000190245065300150246965300160248465300190250065300160251965300130253570000130254870000180256170000150257970000180259470000220261277301660263410617682021-02-25       2018    bl uuuu     u00u1 u    #d  a2457-05917 a10.9734/JEAI/2018/392042DOI1 aMILECH, C. G.  aChilling requirement of ten peach cultivars estimated by different models.h[electronic resource]  c2018  aArticle history: Received 23 November 2017; Accepted 31 January 2018; Published 8 February 2018. Authors' contributions: This work was carried out in collaboration between all authors.Authors CGM, FGHand MCBR designed the study, wrote the protocol and wrote the first draft of the manuscript. Authors MD, SS and JS performed the statistical analysis and managed the literature searches. Author MCBR managed the analyses of the study. All authors read and approved the final manuscript.  aABSTRACT. The adaptation of a temperate climate fruit cultivar to a certain area depends mainly on its chilling requirement and the chilling accumulation in such places. Several attempts have been made to estimate these two conditions, using different models. The great variation among the models to calculate chilling requirement makes it necessary to determine their efficiency in a given location. Aiming to estimate the chilling requirement of ten peach cultivars, including Bonão, Pepita, Maravilha, Precocinho, Turmalina, Diamante, BR-3, Marfim, Coral, and Cambará do Sul, seven models were tested: Utah, Positive Utah, Low Chill, Taiwan, Chilling Hours (≤7.2°C), Chilling Hours (≤11°C), and Dynamic. The results showed that the estimation of chilling accumulation for all the studied cultivars in all the tested models showed a large variability. None of the tested models was perfect for estimating the chilling requirement, especially considering the variable climatic conditions of southern Brazil. Except for the Utah model, any of the others can be used to provide a rough estimate of the chilling requirement of the cultivars; however, the Taiwan and Low Chill models seem to be more suitable. The chilling requirement, which was estimated based on the average over the 11 years of the study, overestimated the real need, when compared to the yields over those years. There are differences among the studied cultivars; however, with the exception of Cambará do Sul, all the others can yield good crops and show good adaptation to the climatic conditions of the southern Rio Grande do Sul. © Copyright 2010-Till Date, Journal of Experimental Agriculture International. All rights reserved.  aPRUNUS PERSICA  aAdaptation  aChill hours  aChill portions  aChill units  aDORMANCY1 aDINI, M.1 aSCARIOTTO, S.1 aSANTOS, J.1 aHERTER, F. G.1 aRASEIRA, M. C. B.  tJournal of Experimental Agriculture International, February 2018, Volume 20, Issue 4, p. 1-9. Article no.JEAI.39204. DOI: https://doi.org/10.9734/JEAI/2018/39204