Data/hora: 20/05/2024 14:36:34

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - B
Data corrente: | 10/07/2020
Data da última atualização: | 10/07/2020
Autoria: | BRIGHENTI, A. F.; PASA, M. S.; BRIGHENTI, E.; CIOTTA, M. N.; SOUZA, Z. S.
Título: | Fruitlet growth model to predict chemical thinning response on apples in southern Brazil.
Ano de publicação: | 2020
Fonte/Imprenta: | Acta Hosticulturae, Belgium, n. 1281, p. 265-272, 2020.
Idioma: | Inglês

Conteúdo:

Variability and unpredictability in chemical thinning has been a problem for
apple growers for over 50 years. This situation motivated an intense work to identify
factors related to fruit abscission. Among such factors, daily fruit measurement is the
only practical method to assess early thinner response. Measuring fruit growth is useful
to assess potential fruit drop after thinner application. The objective of this study was
to evaluate the efficiency of fruitlet growth model for prediction of chemical thinning
on apples in southern Brazil. The work was carried out in São Joaquim - Santa Catarina
State, in the orchards of Epagri - São Joaquim Experimental Station (28°16?30?S;
49°56?09?W, altitude 1,400 m). The orchard was planted in 2006, the evaluated
cultivars were ?Fuji Suprema? and ?Maxi Gala?, grafted on M.9 with 1×4 m spacing. At 4
days after thinner application, 50 fruits tree-1 were measured. After 6 days new
measurements were taken. The data obtained were inserted in the worksheet
developed by Greene et al. (2013). Based on growth rate, the prediction of thinning
efficiency and whether there was a need for new applications or not were determined.
The following thinning treatments were compared: i) ?conventional? chemical thinning
? benzyladenine (10/14) + manual thinning (11/8); ii) chemical thinning based on the
fruitlet growth model ? 2 applications of benzyladenine (10/14 and 10/21) +
metamitron (11/9). The number of fruit predicted by the model, the number of fruit
manually thinned and the number of fruit harvested were evaluated. The fruitlet
growth model to predict chemical thinning response was accurate when comparing the
number of fruits predicted and number of fruits produced by a tree. The results of the
first year are promising and indicate that the model can be useful on the decision
making process of proper timing and need for additional chemical thinning
application.

Palavras-Chave: | fruit growth rate; Malus domestica Borkh; predict thinning.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_45909.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (104749-1) - UPC - AP - DD -  -  -  - DIS