Models for Quantifying Winter Effective Chilling Adapted to Uruguayan Apple Production

Authors

  • Vivian Severino Facultad de Agronomía, Universidad de la República.Garzón 780, Montevideo, Uruguay.
  • Héctor Arbiza Facultad de Agronomía, Universidad de la República.Garzón 780, Montevideo, Uruguay.
  • Mercedes Arias Facultad de Agronomía, Universidad de la República.Garzón 780, Montevideo, Uruguay.
  • Matías Manzi Facultad de Agronomía, Universidad de la República.Garzón 780, Montevideo, Uruguay.
  • Alfredo Gravina Facultad de Agronomía, Universidad de la República.Garzón 780, Montevideo, Uruguay.

DOI:

https://doi.org/10.31285/AGRO.15.589

Keywords:

Chill Hours, Malus domestica, Chill Units

Abstract

In Uruguay UTAH and CH models are usually applied for estimation of chilling accumulation, regardless of which specie or cultivar is considered, although there are evidences of lack of fitness to the phenologyc behaviour of the most cultivars. Chemical rest breaking agents to compensate the chilling requirements in apple (Malus domestica Borkh) are widely used and winter chill quantification should be a relevant issue to adjust this technique. The objective of this work was to quantify the occurrence of winter chill during the endodormancy period with six models, in two apple cultivars (‘Red Chief’, ‘Granny Smith’), according to development indicators of sprouting process. The models used were CH, UTAH, UTAH+, Dynamic Model, North Carolina Model and Model for Subtropical Conditions. Beginning of the endodormancy release was considered when 50% of leaf fall was reached and the end of the process when 50% of one-year-old shoot buds sprouted in a forcing chamber. Although the Dynamic model appears to be more promising, a longer evaluating period is needed to evaluate the fitness of these models.

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Published

2011-12-01

How to Cite

1.
Severino V, Arbiza H, Arias M, Manzi M, Gravina A. Models for Quantifying Winter Effective Chilling Adapted to Uruguayan Apple Production. Agrocienc Urug [Internet]. 2011 Dec. 1 [cited 2024 Jun. 14];15(2):19-28. Available from: https://agrocienciauruguay.uy/index.php/agrociencia/article/view/589

Issue

Section

Plant production
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