CHILLING AND HEAT REQUIREMENTS AND BUDBREAK STIMULATION OF APPLE ?AGUA NUEVA II?

Authors

  • José Luis Miranda-Blanco
  • A. Enrique Becerril-Román
  • Alberto Castillo-Morales
  • Ramiro Vega-Nevarez

Keywords:

Malus pumila Mill., chilling units, budbreak, growing degree hours, phenology

Abstract

The objective of this research was to determine the requirement in chilling units (CU) and growing degree hours (GDH) of apple (Malus pumila Mill.) cv. ?Agua Nueva II? cuttings under controled environment conditions, and also to evaluate the effect of budbreak promoters on four years-old apple trees under field conditions. The highest percentage of vegetative budbreak corresponded to 550 CU and 24 108 GDH, which were statistically equal to those treatments with 450, 500 and 600 CU. Among the budbreak treatments, Dormex at 20 mL L-1 plus winter oil at 10 mL L-1, gave the highest vegetative budbreak. The percentage of vegetative budbreak under controlled conditions and the control under field conditions correlated with the GDH requirement (r= 0.88**).

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Published

30-03-1997

Issue

Vol. 31 No. 1 (1997): 1997-ene-mar

Section

Crop Science

License

Agrociencia is published every 45 days, in an English format, and it is edited by the Colegio de Postgraduados. Mexico-Texcoco highway Km. 36.5, Montecillo, Texcoco, Estado de México, CP 56264, Telephone (52) 5959284427. www.colpos.mx. Editor-in-Chief: Dr. Fernando Carlos Gómez Merino. Rights Reserved for Exclusive Use: 04-2021-031913431800-203, e-ISSN: 2521-9766, granted by the National Institute for Author Right.