Condutividade elétrica em função do teor de água inicial de sementes de amendoim

Barbosa, Rafael Marani; Silva, Clíssia Barboza da; Medeiros, Maria C. R.; Centurion, Maria Aparecida Pessôa da Cruz; Vieira, Roberval Daiton

doi:10.1590/s0103-84782012000100008

Cited by 25 publications

(24 citation statements)

References 8 publications

(16 reference statements)

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“…The results obtained in the electrical conductivity test were consistent with the principles of the test, given that as the time of pre-soaking of the seeds increases, the membrane system is reconstituted and leaching decreases (Table 4). This behavior was observed by Barbosa et al (2012) in peanut seeds. Thus, the more disorganized the membrane system is, the greater the quantity of leachates lost at the beginning of pre-soaking will be, and, therefore, the discrimination of lots in different qualities will be greater (Kryzanowsky; Franca-Neto, 1999).…”

Section: Lotsupporting

confidence: 56%

“…Soaking the seeds for a period before the electrical conductivity test would allow a pre organization of the membrane system and may reduce the interference of large amounts of solutes released in the early hours of soaking in the electrical conductivity test leading to more reliable results. Barbosa et al (2012) observed that peanut seeds with higher hydration exhibit lower electrical conductivity values and the quantity of leached solutes becomes stable more quickly in relation to dry seeds, providing results more in line with the physiological quality of the lots.…”

Section: Introductionmentioning

confidence: 82%

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Accelerated Aging and Electrical Conductivity Tests in Crambe Seeds

et al. 2015

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The aim of this study was to adapt the methodology of the accelerated aging and electrical conductivity tests for determination of physiological potential in crambe seeds. Six seed lots of crambe (cv. FMS Brilhante) were subjected to determination of moisture content, germination test, first count germination, emergence, and emergence speed index. For the accelerated aging test, the traditional methodology was used with water, and with a saturated potassium chloride and sodium chloride solution in three periods of exposure (24, 48, and 72 hours) at 41°C; the electrical conductivity test was performed with four pre-soaking treatments (0, 2, 4, and 8 hours) and four soaking periods (4, 8, 16, and 24 hours) at 25°C. The accelerated aging test with water for 72 hours and the electrical conductivity test with 2 hours of pre-soaking and assessment after 16 hours were effective for classification of the crambe seed lots in regard to physiological quality. Index terms:Crambe abyssinica, vigor, physiological quality. RESUMOConduziu-se esta pesquisa, com o objetivo de adequar a metodologia dos testes de envelhecimento acelerado e condutividade elétrica para determinação do potencial fisiológico em sementes de crambe. Seis lotes de sementes de crambe cultivar FMS Brilhante foram submetidos à determinação do teor de água, teste de germinação, primeira contagem de germinação, emergência, índice de velocidade de emergência. Para o teste de envelhecimento acelerado, foi utilizada a metodologia tradicional com o uso de água e com solução saturada de cloreto de potássio e cloreto de sódio em 3 períodos de exposição (24, 48 e 72 horas) a 41°C; o teste de condutividade elétrica foi realizado com quatro tratamentos de pré-embebição (0, 2, 4 e 8 horas) e quatro períodos de embebição (4, 8, 16 e 24 horas) a 25°C. O teste de envelhecimento acelerado com água por 72 horas e o teste de condutividade elétrica com 2 horas de pré-embebição e avaliação, após 16 horas, foram eficientes para a classificação dos lotes de sementes de crambe quanto à qualidade fisiológica. Termos para indexação:Crambe abyssinica, vigor, qualidade fisiológica.

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Section: Lotsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 82%

Accelerated Aging and Electrical Conductivity Tests in Crambe Seeds

et al. 2015

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“…The increase in electrical conductivity may be implicated in the major damage caused by the drying air temperature on the cellular structure of the grains during drying, causing them to lose physiological and nutritional quality (Barbosa et al, 2014). Likewise, it was found that higher initial contents of water increase the risk of deterioration of grains during drying, due to the longer exposure to the temperatures of the drying air.…”

Section: Resultsmentioning

confidence: 99%

Adjustment of mathematical models and quality of soybean grains in the drying with high temperatures

Coradi

Fernandes

Helmich

2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe aim of this study was to evaluate the influence of the initial moisture content of soybeans and the drying air temperatures on drying kinetics and grain quality, and find the best mathematical model that fit the experimental data of drying, effective diffusivity and isosteric heat of desorption. The experimental design was completely randomized (CRD), with a factorial scheme (4 x 2), four drying temperatures (75, 90, 105 and 120 ); however, not affect the final yield of the oil extracted from soybean grains (15.69%).Ajustes de modelos matemáticos e qualidade de grãos de soja na secagem com altas temperaturas R E S U M O O objetivo deste estudo foi avaliar a influência do teor de água inicial da soja e as temperaturas do ar de secagem sobre a cinética de secagem, qualidade do grão e encontrar o melhor modelo matemático que se ajustar aos dados de secagem experimental, a difusividade efetiva e o calor isostérico de dessorção. Foi adotado o delineamento experimental inteiramente casualisado (DIC) com esquema fatorial (4 x 2), quatro temperaturas de secagem (75, 90, 105 e 120 0 C) e dois teores de água inicial (25 e 19% b.s.) com três repetições. O teor de água inicial do produto interferiu no tempo de secagem. O modelo de Wang e Singh mostrou-se mais adequado para descrever o processo de secagem dos grãos de soja para as faixas de temperaturas do ar de secagem de 75, 90, 105 e 120 ºC e teores de água iniciais de 19 e 25% (b.u.). A difusividade efetiva obtida da secagem dos grãos de soja foi maior (2,5 x 10 -11 m 2 s -1) para a temperatura de 120 ºC e teores de água de 25% (b.s.). A secagem dos grãos de soja com temperaturas mais elevadas (acima de 105 ºC) e com maior teor de água inicial (25% b.u.) aumentou também a quantidade de energia (3894,57 kJ kg -1 ), ou seja, o calor isostérico de dessorção necessário para realizar o processo. A temperatura do ar de secagem e dos diferentes teores de água inicial afetou a qualidade dos grãos de soja ao longo do tempo de secagem (condutividade elétrica de 540,35 µS cm -1 g -1 ), no entanto, não interferiu no rendimento de óleo final extraído dos grãos de soja (15,69%).

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“…In the present study, before conducting the test the seed moisture content should be uniform around 10 % in order to reduce the effect of moisture content for electrical conductivity test. Barbosa et al, 2012 revealed that the groundnut seeds moisture content between 10% and 14% before conducting the electrical conductivity test is suitable for electrical conductivity test.…”

Section: Resultsmentioning

confidence: 99%

Comparative Studies on Different Methods of Estimation of Electrical Conductivity in Groundnut

Suganthi¹,

Selvaraju²

2017

Int.J.Curr.Microbiol.App.Sci

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Condutividade elétrica em função do teor de água inicial de sementes de amendoim

Abstract: RESUMO O vigor de sementes de amendoim (Arachis hypogaea L.) avaliado pelo teste de condutividade elétrica demonstra estreita relação com o desempenho no campo, mas alguns fatores podem afetar o resultado da

Cited by 25 publications

References 8 publications

Accelerated Aging and Electrical Conductivity Tests in Crambe Seeds

Accelerated Aging and Electrical Conductivity Tests in Crambe Seeds

Adjustment of mathematical models and quality of soybean grains in the drying with high temperatures

Comparative Studies on Different Methods of Estimation of Electrical Conductivity in Groundnut

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