Teste de condutividade elétrica individual na avaliação da qualidade fisiológica de sementes de café (Coffea arabica L.)

Costa, Paula de Souza Cabral; Carvalho, María Laene Moreira de

doi:10.1590/s1413-70542006000100013

Cited by 13 publications

(12 citation statements)

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“…Additionally, it was possible to verify that greater variability occurred in seed lots with low physiological quality, which showed more discrepancy in the values (Table 3; Figure 2). These results agree with those of Costa and Carvalho (2006) found in a study carried out on coffee beans.…”

Section: Individual Electrical Conductivity Test For the Assessment Osupporting

confidence: 93%

“…Previous studies have already shown that several factors, such as cultivar (DIAS; MARCOS FILHO, 1996), seed storage conditions (PANOBIANCO; VIEIRA; PERECIN, 2007;ABREU et al, 2011), seed pathogens (WAIN-TASSI et al, 2012), the initial water content of seeds (VIEIRA et al, 2002), and seed physiological quality (COSTA; CARVALHO, 2006) can affect the results of the electrical conductivity test. When the data shown in Figure 1 and Tables 3 are compared, it was possible to verify that the partition point for normal seedlings, abnormal seedlings, and dead seeds varied according to the physiological quality of each seed lot.…”

Section: Individual Electrical Conductivity Test For the Assessment Omentioning

confidence: 99%

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Individual electrical conductivity test for the assessment of soybean seed germination

et al. 2015

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Soybean seed quality is affected by many factors, which may occur during the production, processing, and storage phases. To ensure the quality of seeds, the adoption of fast and efficient methods to estimate seed viability in quality control programs is important. This study aimed to determine a partition point of the individual electrical conductivity test to predict soybean seed germination. Three lots each of five different soybean cultivars (Fundacep 57 RR, BMX Potência RR, BMX Força RR, BMX Turbo RR, and Nidera 7321 RG) were used. Seed quality was assessed through the mass of 1,000 seeds (MTS), moisture content (MC), germination test (G), bulk electrical conductivity (BEC), individual electrical conductivity (IEC), accelerated ageing (AA), and field seedling emergence (FSE). To determine a partition point in the IEC test for predicting germination, seeds were subjected to the germination test in the same position used for the IEC test. The accuracy of the partition point was tested by comparing predicted germination with the standard germination test. The partition point obtained for normal seeds was 130 µS .cm -1 .seed -1 . The IEC test, however, had limitations in predicting soybean seed germination. The data for predicted germination were different from those obtained by the standard test, because the characteristics of each lot led to differences in the electrical conductivity values. Key words: Glycine max (L.) Merrill, partition point, fast test, seed quality ResumoA qualidade das sementes de soja pode ser afetada por inúmeros fatores que podem ocorrer em qualquer etapa da produção. Para garantir a qualidade das sementes é necessária a adoção testes rápidos e eficientes em estimar a viabilidade das sementes. O objetivo desse estudo foi determinar o ponto de partição do teste de condutividade elétrica individual (CEI) para estimar a germinação de sementes de soja. Foram utilizados 15 lotes pertencentes a diferentes cultivares (Fundacep 57 RR, BMX Potência RR, BMX Força RR, BMX Turbo RR, e Nidera 7321 RG). A caracterização dos lotes foi efetuada pelo peso de mil sementes, teor de água, germinação, condutividade elétrica massal e individual, envelhecimento acelerado e emergência a campo. Para determinação do ponto de partição as sementes foram submetidas ao teste padrão de germinação, respeitando-se a posição utilizada na leitura da CEI. A veracidade do

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Section: Individual Electrical Conductivity Test For the Assessment Osupporting

confidence: 93%

Section: Individual Electrical Conductivity Test For the Assessment Omentioning

confidence: 99%

Individual electrical conductivity test for the assessment of soybean seed germination

et al. 2015

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“…Os tamanhos de amostras comumente utilizados em outros trabalhos avaliando a condutividade elétrica individual de sementes são de: 100 sementes para trigo (Mertz et al 2012) e para soja (Salinas et al 2010;Barbieri et al 2013); 50 sementes para mamona (Souza et al 2009) e para café (Costa e Carvalho 2006). Os resultados apresentados neste trabalho servem de referência de tamanho ótimo de amostra para estimação da condutividade elétrica individual de sementes de girassol, de acordo com a precisão desejada pelo pesquisador, de forma a buscar confiabilidade nos resultados de testes estatísticos.…”

Section: Resultsunclassified

“…No Brasil, esse teste apresentou bons resultados para sementes de café (Costa e Carvalho 2006), trigo (Mertz et al 2012) e soja (Barbieri et al 2013). No entanto, para girassol, as informações ainda são escassas.…”

Section: Fitotecnia -Artigounclassified

Tamanho de amostra para determinação da condutividade elétrica individual de sementes de girassol

et al. 2017

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This technique has the advantage of not depending on the probability distribution of the data. The objective of this study was to estimate the sample size required for the individual electrical conductivity test in sunflower seeds. Seven lots of sunflower seeds were used: 3 lots of the cultivar Hélio 250, 2 of the BRS 323, and 2 of the BRS 324.The individual electrical conductivity test was conducted with each lot of 400 seeds, and the sample size was determined by the seed number from which the amplitude of the 95% confidence interval (AIC 95% ) was less than or equal to 15, 20, 25, 30, and 35% of the mean estimate. The sample size of 483, 257, 172, 115, and 85 seeds is sufficient to estimate the average of the individual electrical conductivity of sunflower seeds with an AIC 95% equal to 15, 20, 25, 30, and 35% of the mean estimate, respectively, for all lots and soaking periods.

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“…Physiological analyses have been an efficient tool for separating coffee seeds into different quality levels (COSTA; CARVALHO, 2006) due to their correlation with the integrity of cell membranes. Higher values of potassium leaching and electrical conductivity are observed in coffees with more physiological damage and worse beverage quality.…”

Section: Introductionmentioning

confidence: 99%

Quality of conilon coffee dried on a concrete terrace in a greenhouse with early hulling

Partelli

Partelli²,

Partelli³

et al. 2014

Sem. Ci. Agr.

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The time spent in coffee drying is quite important for keeping the product quality and therefore choosing the appropriate method to be used. This study was performed to quantify the decrease in drying time as a result of early hulling of conilon coffee (Coffea canephora) dried on a concrete terrace in a greenhouse, as well as to determine the quality of the dried coffee. The coffee was harvested at more than 80% ripe fruits and immediately placed on concrete terraces in greenhouses for drying. The parcels were hulled when 22%, 19%, 16% and 13% (wb) moisture levels were reached. Then, the parcels hulled at 22%, 19% and 16% moisture were returned to the greenhouse until they reached the desired moisture level of 13% (wb). The time spent on drying was quantified, and coffee quality was assessed through sensory, chemical and physiological analyses. This procedure was performed in four distinct periods during the harvest, and four repetitions were performed in blocks. The F (ANOVA) and Tukey (at 5% of probability) tests were performed to compare the evaluated characteristics among groups. The coffee hulled at 22% (wb) moisture content presented a considerably shorter drying time (6 days shorter) than the coffee hulled at 13% (wb) moisture content. The early hulling of conilon coffee did not affect the final quality. Thus, early hulling is a practical and significantly favorable technique for coffee farmers because it decreases drying time and improves the use of terrace space without diminishing coffee quality. Key words: Coffea canephora, robusta, drying, electrical conductivity, reducing sugars ResumoO tempo despendido na secagem é fundamental para manter a qualidade do produto e escolher o procedimento de secagem a ser adotado. Esse trabalho teve como objetivo quantificar a redução do tempo de secagem com beneficiamento prévio do café conilon (Coffea canephora) em terreiro de estufa, bem como avaliar a qualidade dos grãos secos. O café conilon foi colhido com mais de 80% de frutos maduros e colocados, simultaneamente, em terreiros de estufas. Assim, as parcelas foram beneficiadas no momento em que atingiram 22%, 19%, 16% e 13% de umidade (bu). As parcelas com 22%, 19% e 16% (bu), foram levadas de volta ao terreiro até que atingissem o nível de umidade ideal de 13% (bu). O tempo de secagem foi quantificado e a qualidade do produto avaliada através análise sensorial, química e fisiológica. O trabalho foi realizado em blocos ao acaso, com quatro repetições, e 1 Engº Agrº, Dr. Prof., Deptº de Ciências Agrárias e Biológicas, Universidade Federal do Espírito Santo, UFES, São Mateus, ES.Brasil. E-mail: partelli@yahoo. os resultados submetidos ao teste F (ANOVA) e teste de média (Tukey a 5% de probabilidade). Houve diminuição de 6 dias na secagem do café beneficiado a 22% de umidade, comparado ao café beneficiado a 13%. O beneficiamento prévio do café conilon não afetou a qualidade final. Assim, conclui-se que o beneficiamento prévio do café com 22% (bu), com posterior secagem até atingir 13% é uma prática que fav...

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Teste de condutividade elétrica individual na avaliação da qualidade fisiológica de sementes de café (Coffea arabica L.)

Cited by 13 publications

References 0 publications

Individual electrical conductivity test for the assessment of soybean seed germination

Individual electrical conductivity test for the assessment of soybean seed germination

Tamanho de amostra para determinação da condutividade elétrica individual de sementes de girassol

Quality of conilon coffee dried on a concrete terrace in a greenhouse with early hulling

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