Composição do substrato, vigor e parâmetros fisiológicos de mudas de timbaúva (Enterolobium contortisiliquum (vell.) morong)

Abstract

RESUMO -Este trabalho objetivou avaliar a influência da composição de um substrato organoarenoso sobre a emergência e parâmetros fisiológicos de crescimento de plântulas de timbaúva. As sementes foram submetidas à germinação nas seguintes composições do substrato: T 1 ) 100% areia; T 2 ) 75% areia + 25% Tecnomax ® ; T 3 ) 50% areia + 50% Tecnomax ® , T 4 ) 25% areia + 75% Tecnomax ® ; e T 5 ) 100% Tecnomax ® . As avaliações foram efetuadas aos 45, 90, 135 e 180 dias após a semeadura, aferindo a altura da parte área e o diâmetro do coleto. Aos 180 DAS, determinaram-se a massa da matéria seca de parte aérea, a massa da matéria seca de raízes, a massa da matéria seca total e os teores de clorofila a, b e clorofila total. A emergência e os parâmetros fisiológicos de crescimento foram afetados negativamente pela composição exclusiva de Tecnomax ® , assim como os valores de clorofila b. O substrato comercial associado ao material inerte (areia) proporcionou maior expressão do vigor das sementes, teores de clorofila b e maior crescimento de mudas de timbaúva.Palavras-chave: Teores de clorofila, Biometria e Massa da matéria seca SUBSTRATE COMPOSITION, VIGOR AND PHYSIOLOGICAL PARAMETERS OF TIMBAÚVA SEEDLINGS (Enterolobium contortisiliquum (VELL.) MORONG)ABSTRACT

Tabernaemontana catharinensis A. DC. Seedling Emergence and Growth in Different Substrates

“…According to Saidelles et al (2009), the RDM and SDM values should be similar to supply the shoot's demand for water and minerals. When working with different substrate compositions in the production of Pacara Earpod Tree (timbaúva) (Enterolobium contortisiliquum) seedlings, Afonso et al (2012) observed that this ratio was maintained at 1:1, showing that the shoot should be equivalent to the root.…”

“…In the last decade the forestry sector has been highlighting the search for native species with potential for use in reforestation programs, urban afforestation and reconstitution of areas for plant preservation (Basso et al, 2011). However, unlike commercial plants, there is a large gap regarding knowledge about the germination potential, growth and development of seedlings of native tree species in relation to different biotic and/or abiotic factors influencing them (Afonso et al, 2012).…”

Growth and quality of Handroanthus serratifolius seedlings in soils incorporating amendments and inorganic residues

“…Thus, as a result of the difficulties in germinating the seeds and the growing demand for good quality seedlings, it is necessary to formulate substrates that will promote the emergence, growth and quality of the seedlings (Goulart et al, 2017). Differently from plants cultivated for commercial purposes, there is little information regarding the germinative potential, development of native arboreal species seedlings and also about the composition of substrates (Afonso et al, 2012).…”

Shading as a conditioning factor to forest species planting: a study with Apuleia leiocarpa

“…Evaluating plants in shading experiments addresses physiological parameters such as chlorophylls and carotenoids contents, which provides important information on the establishment, growth and plasticity of the photosynthetic apparatus (Afonso et al 2012). In addition to morphological parameters as height and stem diameter.…”