Data/hora: 09/05/2024 10:18:30

Biblioteca(s): | Epagri-Sede.
Data corrente: | 12/04/2011
Data da última atualização: | 12/04/2011
Autoria: | PETRI, J. L.; LEITE, G. B.; HAWERROTH, F. J.
Afiliação: | Epagri
Título: | Time of Erger Application for Budbreak Induction in Apple Trees.
Ano de publicação: | 2010
Fonte/Imprenta: | Acta Horticulturae, Leuven, v. 872, p. 205-210, 2010.
Idioma: | Inglês
Notas: | ISSN, 0567 7572

Conteúdo:

More than 50% of the Southern Brazilian apple production is located in areas where chilling varies from 800 to 1.200 cold units by the North Carolina model, or from 400 to 600 hours of temperature below 7.2°C. This low chilling results in budbreak and blooming delay, which requires artificial budbreak induction. Erger, an inorganic nitrogen compound, combined with calcium nitrate, has a similar effect to that of hydrogen cyanamid, with the advantage of being less dangerous to the environment. Budbreaking products are influenced by environmental factors, but mainly by the temperature at the time of application or during the following days, which should be at least 20°C. The aim of this experiment was to evaluate the effects of time of Erger 5% + Calcium Nitrate 5% application on budbreak induction of ?Imperial Gala? and ?Suprema? apple trees. The experiment was carried out in Caçador, Brazil (lat. 26°46?31?), in an RCB design with five
treatments and six single tree replications. The treatments were a check and four
fortnightly Erger applications. Phenology, axillary and terminal budbreak, fruit set,
fruits per cluster and mean fruit weight were evaluated. In comparison with the
check treatment, Erger 5% + calcium nitrate 5% anticipated up to 28 days the full
bloom of ?Imperial Gala? when applied on August 15, but only up to 13 days if
applied on September 15. The effect on ?Suprema? was at a lesser extent than on
?Imperial Gala?. The axillary?s budburst of ?Imperial Gala? significantly increased
when the plants were treated on August 1, differing from the check up to 60 days
after application. The axillary?s budbreak on ?Suprema? was greater than on the
check trees except for the application on August 15 because of the low temperature
that persisted also during the following days. The low temperature affected the
response in both cultivars. Fruit set of ?Imperial Gala? was not affected by the time
of treatment application, but it was reduced in ?Suprema? when applied on August 1.
There was a tendency of mean fruit weight increase on treated plants, probably
related to a longer bloom-ripening period.

Palavras-Chave: | Budbreaking products; Dormancy; Dormência; Maçã; Malus domentica; Time of application.
Categoria do assunto: | --
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_902.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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