Heat Requirement for Blooming and Leafing in Peach

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  • 1 Centro Federal de Educação Tecnológica do Paraná, Cx. P. 571, 85503-390, Pato Branco, PR, Brazil
  • | 2 Embrapa Clima Temperado, Cx. P. 403, 96001-970, Pelotas, RS, Brazil
  • | 3 Universidade Federal de Pelotas, Cx.P. 345, 96001-900, Pelotas, RS, Brazil

Differences in heat requirements for blooming and leafing were investigated in peach [Prunus persica (L.) Batsch] using artificially chilled excised shoots and potted trees. `Della Nona' and `BR-1' have high heat requirements; `Planalto', `Sunlite', and `Eldorado' are intermediate; and `Precocinho' and `Riograndense' have low heat requirements. Prolonged chilling enhanced leafing more than blooming. Flower and vegetative buds have different heat requirements during ecodormancy.

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