Floração da variedade Tobias (Citrus sinensis Osbeck.) sobre três porta-enxertos no Vale do Taquari-RS

Abstract

RESUMO -O objetivo do trabalho foi determinar a plena floração (70% de flores abertas) de uma variedade cítrica no Vale do Taquari -RS, no ano de 2003. O trabalho foi realizado no Centro de Pesquisa de Fruticultura de Taquari, em um pomar de laranjeira Tobias, com 16 anos de idade, e enxertado sobre os seguintes porta-enxertos: C13, Poncirus trifoliata e Laranjeira Caipira, denominadas de Tobias 1, Tobias 2 e Tobias 3, respectivamente. A data utilizada como início da floração foi 1º/09/2003. A plena floração foi estimada em 16-07 para a variedade Tobias enxertada sobre C13 e Poncirus trifoliata e 19-07 sobre Laranjeira Caipira; a combinação Tobias 2 apresentou a data de plena floração antes da Tobias 3; o quadrante Sul reduz a média da plena floração da Laranjeira Tobias sobre a Laranjeira Caipira (Tobias 3). Termos para indexação: Citros, florescimento, porta-enxerto, quadrantes BLOOM OF TOBIAS VARIETY (Citrus sinensis Osbeck.) ON THREE ROOTSTOCKS IN TAQUARI VALLEY, RS ABSTRACT -The objective of this work was to determine the date of the full bloom (70% of open flowers) in a citric variety in Taquari Valley -RS, in 2003. The work was carried out in the Research Center of Fruticulture of Taquari, in an orchard with 16 years old. The variety of citrus studied was the Tobias on three rootstocks: C13, Poncirus trifoliata and orange tree Caipira, called Tobias 1, Tobias 2 e Tobias 3, respectively. The date considered the beginning of flowering was 09/01/2003. The full bloom was estimated in 07/16 to Tobias variety on C13 and Poncirus trifoliata rootstock and 07/ 19 on Caipira orange tree; the combination Tobias 2 showed the date of full bloom before Tobias 3; the South quadrant reduces the media of the full bloom of the Tobias orange tree on Caipira orange tree (Tobias 3).

'Valencia' sweet orange tree flowering evaluation under field conditions

“…Adequate environmental conditions and suitable plant nutrition are two essential needs for citrus production; nevertheless, a key developmental process that determines the orchard yield is flowering. Since flowering and fruit set are important elements involved in the forecast of citrus production, many studies have been carried out to evaluate these phenological phases (Araújo et al, 1999;Agustí et al, 2000;Koller et al, 2000;Tonietto & Tonietto, 2005).…”

“…An important point is the flowering evaluation method, which is not standardized and thus forces comparisons to previous literature. Regarding flowering evaluation, some authors have considered only branches or shoots of the plant canopy (Lomas & Burd, 1983;Rocha et al, 1990;Nuñez et al, 1992;Koshita et al, 1999;Tonietto & Tonietto, 2005), while others have used a visual scale or taken measurements with frames (hollow squares with varying areas) positioned at single or multiple regions around the plant canopy (Holguín et al, 1992;Nuñez et al, 1992;Araújo et al, 1999;Koller et al, 2000;Sanches et al, 2001).…”

“…The above aspects were addressed to optimize the method for studying citrus flowering, maximizing the field work and obtaining reliable data on flowering intensity. Since flowering may be influenced by rootstock (Holguín et al, 1992;Tonietto & Tonietto, 2005), this work was developed with 'Valencia' sweet orange plants grafted on 'Cleopatra' mandarin and 'Rangpur' lime rootstocks.…”

BIOLOGY OF POLLINATION OF Citrus sinensis VARIETY ‘PERA RIO’

“…Koller (1994) defined that flowering of citrus from the same variety of the present study in tropical climates may occur during all the annual seasons. In the South of Brazil, some works that used the varieties 'Pera Rio', 'Valência' and 'Bahia' defined the month of September for flowering (TONIETTO, TONIETTO, 2005;VITTI et al, 2003). For the State of São Paulo, the flowering of the 'Pera Rio' variety was defined by Di Giorgi (1991) between the months of June and August and in the event of pluviometric variation and temperature there may be blooms outside this period.…”

Desenvolvimento e qualidade da lima ácida Tahiti em Colorado do Oeste, RO

“…Os grausdia (GD) ou unidades térmicas podem ser usados para determinar, em diversas regiões, a duração da fase compreendida entre o florescimento e a maturação de frutos (Souza, 2001). A caracterização das exigências térmicas mediante o conceito de graus-dia tem sido utilizada por diversos autores (Tonietto & Tonietto, 2005).…”