'Valencia' sweet orange tree flowering evaluation under field conditions

Scientia Agricola

Rafael Vasconcelos Ribeiro²  Glauco De Souza Rolim²  Fernando Alves De Azevedo¹  Eduardo Caruso Machado² 

[1] ,APTA IAC Centro de Pesquisa e Desenvolvimento em Ecofisiologia e BiofísicaCampinas SP ,Brasil

关键词: Citrus spp.;    bloom;    method;    sampling;    Citrus spp.;    brotação;    método;    amostragem;   

DOI  :  10.1590/S0103-90162008000400010

来源: SciELO

【 摘 要 】

Since citrus flowering is a key process in citriculture and its evaluation is often difficult due to the canopy structure and field sampling, the aim of this research was to give some directions regarding the evaluation of flowering in field-grown sweet orange plants. This study was conducted in a citrus orchard of sweet orange plants cv. 'Valencia' [Citrus sinensis (L.) Osbeck] grafted on 'Cleopatra' mandarin (Citrus reshni hort. ex Tanaka) or 'Rangpur' lime (Citrus limonia Osbeck) rootstocks, with North-South orientation. Generative structures [buds, flowers and fruitlets (diameter < 3 cm)] were quantified weekly between August and November 2005, by using a 1 m² frame positioned at the middle third of plant canopy, sampling a volume of about 1 m³. Frames were divided in two parts so that two people could take measurements, and were positioned at Southeast, Southwest, Northeast and Northwest orientations, using seven plants. The following flowering parameters were: (i) number of plants necessary for a representative evaluation of flowering; (ii) plant canopy position to be sampled, and (iii) volume to be evaluated. When considering practical aspects of crop production, a rapid, simple and representative method for flowering evaluation is necessary, especially for growers that frequently have to make strategic decisions about the management of citrus groves. The flowering of field-grown 'Valencia' sweet orange plants can be rapidly assessed by considering at least five plants and sampling canopy volumes of 0.5 m³ in at least one canopy position on each side of the plant row.

【 授权许可】

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