Caracterização física e germinação de sementes de Senna macranthera

Pozitano, Marina; Rocha, Sandra Cristina dos Santos

doi:10.1590/s0101-31222011000400020

Cited by 15 publications

(11 citation statements)

References 10 publications

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“…The coffee senna seed dormancy was overcome by soaking seeds in sulfuric acid for 20 minutes and then washing in running water for five minutes (Pozitano & Rocha, 2011).…”

Section: Bioassaysmentioning

confidence: 99%

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

et al. 2017

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ABSTRACT. Cashew (Anacardium occidentale) nut shell liquid (CNSL) has been successfully used in trials as an Aedes aegypti larvicide, but little is known about its environmental effects. In this study, the potential effects of CNSL and a CNSL-based phyto-product formulation on the germination and growth of Lactuca sativa (lettuce), Lycopersicon esculentum (tomato) and Senna obtusifolia (coffee senna) were assessed. The pH of CNSL and the formulation were 6.4 and 6.8, respectively; the electrical conductivities were 2.89 μS cm -1 (CNSL) and 2.21 μS cm -1 (formulation), respectively, and both contained anacardic acid (53.2%) and degradation products. In bioassays for germination and growth, CNSL (25, 50, 100, 150, and 200 mg mL -1 ), the formulation (100 mg mL -1 ) and the control were used in a completely randomized design. The results demonstrated the chemical effects of CNSL, which negatively affected the germination and vigor of lettuce and tomato and the vigor of coffee senna; for growth, it negatively influenced both the root and aerial parts of lettuce and tomato, but only the roots of coffee senna. The formulation had negative effects on the vigor of coffee senna and the growth of tomato and lettuce seedlings (roots and aerial parts). The results indicate the phytotoxicity of CNSL and the formulation for the plant species tested.Keywords: Anacardiaceae, Anacardium occidentale, CNSL, anacardic acid, allelopathy.Líquido da casca da castanha de caju e formulação: toxicidade sobre sementes de alface, tomate e fedegoso e formação de plântulas RESUMO. O líquido da casca da castanha de caju (LCC) de Anacardium occidentale está sendo utilizado com sucesso em ensaios larvicidas para Aedes aegypti; porém pouco se sabe sobre seus efeitos ambientais. Neste trabalho, o objetivo foi avaliar os efeitos do LCC e de um fitoproduto a base de LCC na germinação e no crescimento de Lactuca sativa (alface), Lycopersicon esculentum (tomate) e Senna obtusifolia (fedegoso). O pH do LCC e formulação é 6,4 e 6,8, respectivamente; a condutividade elétrica 2,89 μS cm -1 (LCC) e 2,21 μS cm -1 (formulação) e ambos contêm ácido anacárdico (53,2%) e produtos de degradação. Nos bioensaios de germinação e de crescimento, utilizou-se LCC (25, 50, 100, 150 e 200 mg mL -1 ) e a formulação (100 mg mL -1 ) e controle, com delineamento inteiramente casualizado. Os resultados demonstraram efeito do LCC, afetando negativamente a germinação e vigor da alface e tomate e o vigor do fedegoso; no crescimento, influenciou negativamente o crescimento da raiz e caule de alface e tomate e no fedegoso, apenas da raiz. A formulação exerceu efeito negativo apenas para sementes de fedegoso e afetou negativamente o crescimento das plântulas de alface e tomate, raiz e parte aérea. Os resultados obtidos indicaram fitotoxicidade do LCC e da formulação para as espécies testadas.

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“…The coffee senna seed dormancy was overcome by soaking seeds in sulfuric acid for 20 minutes and then washing in running water for five minutes (Pozitano & Rocha, 2011).…”

Section: Bioassaysmentioning

confidence: 99%

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

et al. 2017

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“…This angle is observed during the rolling regime, in which the movement of particles forms a flat surface with a constant inclination . The angle of repose is related to the particle density, coefficient of friction, surface area, and shape, therefore knowledge about this angle can help to shed light on the dynamic behaviour of a specific material . Figure presents the dynamic angle of repose for different rotational speeds and filling degrees for both green and roasted coffee beans.…”

Section: Resultsmentioning

confidence: 99%

An experimental analysis of coffee beans dynamics in a rotary drum

et al. 2017

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Brazil is the largest producer and exporter of coffee in the world, one of the main global commodities. During the processing of coffee beans, rotary drums are used in the drying and roasting phases. This equipment is widely used in many industrial sectors. According to characteristics of the drum, particulate material, and operating conditions, different flow regimes may arise. Such regimes have a direct influence on the performance of these processes and therefore their characterization is of great importance. The present work developed an experimental study about the dynamics of coffee beans, under green and roasted conditions, in a rotary drum. Transitions between rolling, cascading, cataracting, and centrifuging regimes were evaluated, for both green and roasted coffee beans. For the centrifuging regime, a comparison between experimental critical rotation speeds and the ones obtained by correlations found in literature was performed. Additionally, a new expression to predict the centrifuging rotation speed was proposed by the authors. Further analyses regarding the rolling regime were also carried out. For this regime, velocity profiles of the particles were evaluated, as well as the thickness of the active layer for different filling degrees and drum rotation speeds. Great similarity was found between the behaviour of the active region for coffee beans before and after the roasting process.

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“…A variação dos valores de densidade dos substratos de 0,32 a 0,41 Mg m -3 (Tabela 2) pode ter afetado a disponibilidade de oxigênio, comprometendo a germinação das sementes, pois a densidade do substrato é inversamente relacionada com a porosidade e, dessa maneira, pode ocorrer maior retenção de água à medida que a densidade aumenta (Barbosa et al, 1985). Destacase que a constituição física do substrato é determinante na produção de mudas (Rebouças et al, 2008), pois a capacidade de absorção de água pelas sementes depende da retenção de água e da aeração do substrato (Pozitano & Rocha, 2011), que é afetado pelo equilíbrio entre a macro e a microporosidade, principalmente Tabela 2. Atributos químicos e físicos dos substratos usados na produção de mudas de E. dunnii e C. trichotoma.…”

Section: Resultsunclassified

Uso de Substrato Compostado na Produção de Mudas de Eucalyptus dunnii e Cordia trichotoma

et al. 2015

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RESUMOOs substratos apresentam influência na germinação e no crescimento de mudas de espécies florestais. Com o objetivo de avaliar a germinação, o crescimento e a qualidade de mudas de Eucalyptus dunnii e Cordia trichotoma em substratos obtidos pela compostagem de resíduos orgânicos foi conduzido um experimento na UFSM, campus de Frederico Westphalen, Brasil. Foram usados quatro substratos de compostagem (resíduos de restaurante universitário, resíduos de reciclagem de lixo domiciliar, dejeto líquido de bovinos e lodo do processo de flotação) e um substrato comercial (com e sem fertilizante mineral). O delineamento foi inteiramente casualizado com quatro repetições. Os substratos influenciaram na velocidade de germinação, mas não afetaram o percentual final de germinação. Os substratos alternativos provenientes de resíduos de restaurante universitário e do lodo de processo de flotação proporcionaram maior altura e diâmetro de colo das mudas E. dunnii e C. trichotoma e podem ser usados em substituição ao substrato comercial.Palavras-chave: resíduos orgânicos, fertilizante mineral, espécies florestais. Composted Substrate in the Production of Eucalyptus dunnii andCordia trichotoma Seedlings ABSTRACTThe substrates have influence on germination and growth of forest species seedlings. Aiming to evaluate the germination, growth and quality of Eucalyptus dunnii and Cordia trichotom seedlings on substrates obtained by composting of organic waste we conducted an experiment at UFSM, campus Frederico Westphalen, Brazil. Four substrates composting (university restaurant waste, recycling household waste, liquid cattle manure and flotation process sludge) and commercial substrate (with and without mineral fertilizer) were used. The design was completely randomized with four replications. The substrates influenced the germination rate, but did not affect the final germination percentage. Alternative substrates from waste of university restaurant waste and flotation process sludge provided greater height and diameter of E. dunni and C. trichotoma seedlings and can be used to replace the commercial substrate.

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Caracterização física e germinação de sementes de Senna macranthera

Cited by 15 publications

References 10 publications

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

An experimental analysis of coffee beans dynamics in a rotary drum

Uso de Substrato Compostado na Produção de Mudas de Eucalyptus dunnii e Cordia trichotoma

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