Estratégias para redução de girassol ornamental para comercialização em vaso
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Data
2009
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Resumo
The objective of the research was to evaluate the use of photoselective plastic shadenet and the
effect of plant growth retardant paclobutrazol drench at different concentrations (0; 0.25; 0.50; 0.75 e 1.0
mg L -1 of substrate) on potted plants of sunflower cv Sunbright Supreme grown under protected
environment. Two greenhouses were covered with transparent polyethylene film, 0,1 mm thick, and at
one of them, the plastic film was applied over a blue photoselective plastic shadenet (30% of shading).
Microclimatic and agronomic parameters were evaluated. The solar radiation was reduced by 27.5 %
when the shadenet was used, which resulted in a very low influence on the air temperature and humidity
in the shelter. Further, the use of the shadenet did not reduced plant height and did not influenced
inflorescence diameter, the number of leaves per plant and the interval from transplant to flowering.
Nevertheless, paclobutrazol substrate drench decreased plant height, leading to more compact plants
that can be grown and commercialized in pots, without any loss to plant quality, since the inflorescence
diameter was not affected. The use of the growth retardant delayed the flowering according to the drench
concentration, but not exceeding one week.
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Tela fotosseletiva, Cultivo protegido, Regulador de crescimento, Helianthus annuus, Photoselective plastic shadenet, Helianthus annuus, Plant growth retardant, Greenhouse
Citação
MATEUS, Caroline de Moura D'Andréa; BOGIANI, Júlio Cesar; SELEGUINI, Alexsander; CASTILHO, Regina Maria Monteiro de; FARIA JUNIOR, Max José de Araújo. Estratégias para redução de girassol ornamental para comercialização em vaso. Bragantia, Campinas, v. 68, n. 3, p. 681-687, 2009.