Fecha/hora: 01/06/2024 06:43:23

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	05/03/2021	
Fecha de la última actualización: 	05/03/2021	
Autoria: 	MILECH, C. G.; SCARIOTTO, S.; DINI, M.; HERTER, F. G.; RASEIRA, M. DO C. B.	
Afiliación: 	CHAIANE GOVEIA MILECH, Universidade Federal de Pelotas - UFPel; SILVIA SCARIOTTO, Empresa Brasileira de Pesquisa Agropecuária - EMBRAPA – Clima Temperado; MAXIMILIANO ANTONIO DINI VIÑOLY, Universidade Federal de Pelotas - UFPel; FLAVIO GILBERTO HERTER, Universidade Federal de Pelotas - UFPel; MARIA DO CARMO BASSOLS RASEIRA, Empresa Brasileira de Pesquisa Agropecuária - EMBRAPA – Clima Temperado.	
Título: 	Models to estimate chilling accumulation under subtropical climatic conditions in Brazil. [Modelos para estimar o acúmulo de frio sob condicoes de clima subtropical no Brasil.]	
Año de publicación: 	2018	
Fuente/Imprenta: 	Revista Brasileira de Climatologia, 2018, v. 23, n. 14, p. 106-115. Doi: http://dx.doi.org/10.5380/abclima.v23i0.53086	
ISSN: 	e-ISSN: 2237-8642	
DOI: 	10.5380/abclima.v23i0.53086	
Idioma: 	Portugués	
Contenido: 	ABSTRACT: 
Chilling requirement is a characteristic that limits temperate fruit crops cultivation under a subtropical climate. Several mathematic models have been developed, differing on the relative value of chilling units, in order to estimate the chilling accumulation on a given site. The present work compared eight of these models using data from hourly temperatures from May to August, from a period of 11 years, collected in Pelotas, RS, Brazil, aiming to characterize the region regarding the chilling accumulation for the cultivation of deciduous fruit trees and to check if a model using average temperatures is suitable enough to be used when hourly temperatures were not available. The eight tested models were: Chilling Hours (?7.2°C); Chilling Hours (?11°C); Utah; Low Chill; Dynamic; Mean Temperatures; Positive Utah and Taiwan. The results showed large differences between years, regardless of the model used. However, the Taiwan and Low Chill models seemed more suitable for the estimation of the accumulation of cold in the Pelotas region. The Medium Temperatures model can be used as a valid option since it has a high correlation with the other models and easy data availability.

RESUMO.
Chilling requirement is a characteristic that limits temperate fruit crops cultivation under subtropical climate. Several mathematic models, differing on the relative value of chilling units have been developed, in order to estimate the chilling accumulation on a given site. The present work compared eight of these models using data from hourly temperatures from May to August, from a period of 11 years, collected in Pelotas, RS, Brazil, aiming to characterize the region regarding the chilling accumulation for the cultivation of deciduous fruit trees and it also had as objective to check if a model using average temperatures is suitable enough to be used when hourly temperatures were not available. The eight tested models were: Chilling Hours (&#8804;7.2°C); Chilling Hours (&#8804;11°C); Utah; Low Chill; Dynamic; Mean Temperatures; Positive Utah and Taiwan. The results showed large differences between years, regardless of the used model. However, the Taiwan and Low Chill models seemed more suitable for the estimation of the accumulation of cold in the Pelotas region. The Medium Temperatures model can be used as a valid option since it has a high correlation with the other models and easy data availability.	
Palabras-Clave: 	Acumulo de frio; Chilling accumulation; Dormancy; Dormência; Frutíferas de clima temperado; Temperate fruits.	
Thesagro: 	FRUTAS DE CLIMA TEMPLADO.	
Categoría del tema: 	F01 Cultivo	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/15272/1/Milech-et-al.-2018-Models-to-estimate-chilling-accumulation-under-RBClima.pdf
https://revistas.ufpr.br/revistaabclima/article/view/53086/36024	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (102522-1) - PXI - AP - DD - PP/Rev.Brasileira Climatologia/2018 -  -  - DIS