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Crescimento de Siegesbeckia orientalis sob diferentes condições de luminosidade

Authors: Aguilera, D.B.; Ferreira, F.A.; Cecon, P.R.;

Crescimento de Siegesbeckia orientalis sob diferentes condições de luminosidade

Abstract

Neste estudo, objetivou-se contrastar os efeitos de sombreamento sobre o crescimento de S. orientalis, utilizando a análise de crescimento. Os experimentos foram conduzidos em vasos, a pleno sol (A) e sob sombrite 50% (B). As plantas tiveram seus índices de crescimento determinados aos 14, 28, 42, 56, 80, 94 e 108 dias após o transplante (DAT), para A; e aos 14, 28, 42, 56, 70, 84, 108, 122 e 136 DAT, para B. O delineamento experimental foi o inteiramente casualizado, com quatro repetições. Os dados foram analisados por meio de análise de regressão. Os modelos foram escolhidos com base na significância dos coeficientes de regressão, utilizando-se o teste t até 10%, no coeficiente de determinação e no fenômeno em estudo. As plantas apresentaram comportamento semelhante em A e B para a maioria das variáveis analisadas, embora as plantas sombreadas (radiação média de 218 µmol m-² s-¹) tivessem maior duração do ciclo cultural, cerca de 140 DAT, retardando os valores máximos e/ou mínimos, em relação às plantas a luz plena (média de 658 µmol m-² s-¹), com aproximadamente 110 DAT. Em B, foram obtidas também as maiores médias para a maioria dos índices avaliados - área foliar, altura, números de folhas e capítulos florais, biomassa seca total, taxa de crescimento absoluto, taxa de crescimento relativo, razão de peso foliar, razão de área foliar e área foliar específica -, sugerindo que a espécie é favorecida pelo sombreamento.

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Keywords

análise de crescimento, growth analysis, shrimp-claw plant, botão-de-ouro, shading, sombreamento

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citations
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.
BIP!Impulse provided by BIP!
20
Average
Top 10%
Average
Green
gold