Resumo

CHAAR, J  e  ASTORGA, D. Determinación del requerimiento de frío y de calor en duraznero [Prunus persica (L.) Batsch.] mediante un modelo de correlación. RIA. Rev. investig. agropecu. [online]. 2012, vol.38, n.3, pp.289-298. ISSN 1669-2314.

Deciduous fruit trees have a rest period between vegetative cycles. For winter dormancy release, buds need to accumulate chill (endodormancy) and then heat (ecodormancy). The aim of this study was to determine chilling and heat requirements of five peach cultivars by means of a correlation model, with full bloom and temperature data collected during seven years, in eastern Mendoza. Chilling requirement ranged from 914 to 1262 chill units, whereas heat requirement fluctuated between 2177 and 6490 growing degree hours. Except in cv. “Prima”, chill requirement variability between years (CV: 18.3 to 18.9%) was greater than that of heat requirement (CV: 6.9 to 13.9%). Heat requirement diminished in years of high chilling accumulation. The model proposed in this study provides more accurate information about thermal requirements of cultivars in order to rationalize crop distribution in the environment.

Palavras-chave : Dormancy; Phenology; Freeze; Quiescence; Temperature.

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