Comparison of methods for estimation of chilling and heat requirements of nectarine and peach genotypes for flowering
- Maulión, Evangelina
- Valentini, Gabriel Hugo
- Kovalevski, Leandro
- Prunello, Marcos
- Monti, Laura Lucía
- Daorden, María Elena
- Quaglino, Marta
- Cervigni, Gerardo Domingo Lucio
DOIAbstract
Chilling and heat requirements for breaking dormancy and flowering were studied in 63 nectarine and118 peach genotypes (Prunus persica (L.) Batsch) for seven years. We compared two methods for estima-tion of requirements and four models for calculation of chill accumulation: Chilling Hours (CH), ChillingUnits (CU), Positive Chilling Units (PCU) and Dynamic, while heat accumulations were estimated in grow-ing degree hours (GDH). Additionally, correlations between chilling requirements, heat requirements andflowering date were established. Our results suggest that the Luedeling model is better than the Alonsomodel to estimate chilling and heat requirements in our field conditions. Moreover, it is recommend-able to calculate the chill accumula...
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