Variation in the full bloom date of peach tree as a function of endo- and ecodormancy temperatures
a theoretical model
DOI:
https://doi.org/10.52945/rac.v36i1.1538Keywords:
Prunus persica, dormancy, chill hoursAbstract
This study evaluates the influence of thermal variables, before and after the estimated date of ecodormancy onset, on the variation in average full bloom dates (DMPF) of peach trees in Urussanga, Santa Catarina, Brazil. Theoretical endodormancy phase lasted approximately 70 days. Average maximum temperature of the last 30 days of endodormancy and the average of the first 20 days of ecodormancy showed the highest correlations with DMPF, with R = 0.88 (P ≤ 0.01) and R = −0.69 (P ≤ 0.05), respectively. A linear regression model with the maximum temperatures of the theoretical endodormancy phase and the average temperatures of the first 20 days of echodormancy explained 96% of the observed DMPF variations. Temperatures below 16oC in the first 40 days of endodormancy, below 22oC in the last 30 days, and above 13oC in the first 20 days of ecodormancy showed negative correlations with DMPF and together explained 93% of the observed variations. Median temperatures (13ºC to 19oC) in the final endodormancy stage had a greater influence on DMPF anticipation than temperatures below 13oC.
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Copyright (c) 2023 Augusto Carlos Pola, Emílio Della Bruna, Henrique Belmonte Petry, Alexsander Luis Moreto
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