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Aplicação de retardadores de crescimento em citrinos ornamentais

Authors: Pinto, M. J.; Faustino, J .J.; Duarte, Amílcar;

Aplicação de retardadores de crescimento em citrinos ornamentais

Abstract

Tendo por objectivo a avaliação dos efeitos de alguns retardadores de crescimento no desenvolvimento vegetativo de citrinos ornamentais, para posterior utilização pelos viveiristas, foi estudado o efeito da aplicação, por pulverização, de quatro retardadores de crescimento a diferentes concentrações, sobre duas espécies do género Fortunella sp. ( F. margarita [ Lour. ] Swing. e F. Obovata Tan. ). Estudámos o efeito da daminozida a 5600, 7500 e 9400 ppm; paclobutrazol a 180, 240 e 300 ppm; CCC a 1050, 1400 e 1750 ppm e dikegulac a 3000, 4000 e 5000 ppm. O desenvolvimento vegetativo das plantas foi observado ao longo de dois ciclos de crescimento, sendo medidos os seguintes parâmetros: comprimento do ramo médio, comprimento final dos entrenós, comprimento e largura do limbo da folha média, número de folhas do ramo. Calculou-se o comprimento final do ramo e a relação comprimento/largura da folha. O primeiro crescimento não apresentou diferenças significativas em relação à testemunha, possivelmente, devido à aplicação tardia dos produtos. No segundo crescimento, as plantas tratadas com paclobutrazol foram significativamente menores, com menores entrenós e folhas mais arredondadas e mais verdes, não se verificando diferenças entre as concentrações. Tanto a daminozida como o CCC, não reduziram de forma significativa o crescimento das plantas tratadas, enquanto o dikegulac se mostrou altamente fitotóxico, nas concentrações utilizadas.

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Portugal
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Keywords

Chlormequat, Fortunella spp., Dikegulac, Daminozida, Paclobutrazol

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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