Condutividade elétrica e teor de água inicial das sementes de soja

Vieira, Roberval Daiton; Penariol, Adilson Luís; Pérecin, Dilermando; Panobianco, Maristela

doi:10.1590/s0100-204x2002000900018

Cited by 88 publications

(101 citation statements)

References 2 publications

(3 reference statements)

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“…This result is probably due to the fact that the fertilizer pH is not very acid, circa 5.28 (Table 1), and thus damaging less the seed tegument. It is known that lower EC values, corresponding to lower lixiviation from seeds, indicate high physiological potential (higher vigor), hence revealing lower intensity of disorganization of cell membranes systems (Vieira et al 2002). Data herein obtained for EC corroborate results of Soratto et al (2003), who have observed increases with the larger periods of contact of seeds with fertilizers, in addition to differences among effects of studied fertilizers, where the single superphosphate was responsible for the larger damages to millet seeds as compared to triple superphosphate.…”

Section: Resultsmentioning

confidence: 99%

Physiological potential of Brachiaria brizantha cv. Marandu seeds kept in contact with phosphatic fertilizers

Peres¹,

Vazquez²,

Cardoso³

2012

Rev. bras. sementes

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-The effect of mixture of seeds of Brachiaria brizantha, cv. Marandu, with different sources, granulometry, and phosphatic fertilizer doses during various periods of exposure on the physiological potential of the seeds has been assessed. The treatments consisted in seed exposure during periods of 0, 3, 6, 12, 24, 36, 48, 72, 96, and 120 h to the following fertilizers: ground granulated single superphosphate (SS), and powdered (SSp); and ground granulated ammonium monophosphate (AMP), at doses of 40 and 80 kg P 2 O 5 ha -1 . Tests of germination, tetrazolium, moisture content, and vigor (first count, electrical conductivity, emergence, emergence speed, and fresh mass of seedlings) were performed. It has been concluded that seed physiological potential of B. brizantha cv. Marandu is reduced with increase on the exposure period to phosphatic fertilizer. Such effect, however, is dependent on the product source, granulometry, and dose. SSp was the most harmful to seeds, followed by SSp and AMP, respectively. Moreover, considering a 60% germination rate as acceptable, it may be inferred that seeds can be kept in contact with AMP and SSp, in dose of 80 kg of P 2 O 5 ha -1 , respectively, for periods of 71.2 and 16.2 hours.Index terms: phosphorus, seed-fertilizer mixture, exposure period, vigor. Termos para indexação: fósforo, mistura adubo-semente, período de exposição, vigor. Potencial fisiológico de sementes de1

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Section: Resultsmentioning

confidence: 99%

Physiological potential of Brachiaria brizantha cv. Marandu seeds kept in contact with phosphatic fertilizers

Peres¹,

Vazquez²,

Cardoso³

2012

Rev. bras. sementes

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“…Loeffler et al (1988) verified the effect of these factors; however the authors stressed that the variables indicated could be controlled by standardizing procedures in order to provide a non-subjective evaluation of the physiological quality of soybean seeds. Later researchers (Hampton et al, 1992;Vieira et al, 1996 and2002) corroborated these results.…”

Section: Introductionmentioning

confidence: 83%

Eletrical conductivity and deterioration of soybean seeds exposed to different storage conditions

Panobianco¹,

Vieira

2007

Rev. bras. sementes

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-Research with soybean seeds has revealed that the results of the electrical conductivity test may be influenced by storage temperature, particularly low temperature, such as 10ºC, suggesting that seed deterioration at low storage temperatures does not seem to be directly related to the loss of the cell membrane integrity. This study was conducted with seeds of two soybean cultivars with the objective of: a) studying the effect of different storage temperatures (10ºC; 20ºC; 25ºC; 20/10ºC and 25/10ºC) on the results of the electrical conductivity test; b) observing the behavior of fatty acids and carbohydrates during storage and studying its relation with the electrical conductivity results. Every three months, from a total of 18 months of storage, the physiological quality of seeds was evaluated using the germination, accelerated aging and electrical conductivity tests. Based on the obtained results, it can be concluded that the electrical conductivity test was not shown to be a good indicative of the deterioration process of seeds stored at low temperatures, and no direct relationship between changes in the fatty acids and carbohydrates and the behavior of the mentioned test for seeds stored at 10ºC was found.Index terms: Glycine max, vigor, physiological quality. CONDUTIVIDADE ELÉTRICA E DETERIORAÇÀO DE SEMENTES DE SOJA SUBMETIDAS A DIFERENTES CONDIÇÕES DE ARMAZENAMENTORESUMO -Pesquisas com sementes de soja têm revelado que os resultados do teste de condutividade elétrica podem ser influenciados pela temperatura de armazenamento, especialmente as mais baixas, como 10 o C, sugerindo que a deterioração da semente a baixas temperaturas de armazenamento parece não estar relacionada diretamente com a perda da integridade das membranas celulares. Este trabalho foi conduzido com sementes de dois cultivares de soja objetivando: a) estudar o efeito de diferentes temperaturas de armazenamento (10ºC; 20ºC; 25ºC; 20/10ºC e 25/10ºC) sobre os resultados do teste de condutividade elétrica; b) observar o comportamento dos ácidos graxos e carboidratos durante o armazenamento e estudar sua relação com os resultados do teste de condutividade elétrica. A cada três meses, num total de 18 meses de armazenamento, a qualidade fisiológica das sementes foi avaliada pelos testes de germinação, envelhecimento acelerado e condutividade elétrica. O teste de condutividade elétrica não mostrou ser um indicador eficiente do processo de deterioração de sementes armazenadas a baixas temperaturas, também não foi observada nenhuma relação direta entre as mudanças nos ácidos graxos, nos carboidratos e no comportamento do referido teste, para sementes armazenadas a 10 o C.Termos para indexação: Glycine max, vigor, qualidade fisiológica.

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“…Although EC test results are reproducible among laboratories, some factors affect the results, such as seed size (Tao, 1978;Deswal & Sheoran, 1993), soaking temperature (Murphy & Noland, 1982), soaking period (Loeffler et al, 1988;Schmidt & Tracy, 1989), initial water content (Tao, 1978;Loeffler et al, 1988;Vieira et al, 2002), and the presence of physical damaged seeds (Tao, 1978;Duke & Kakefuda, 1981). However, all these factors can be controlled to minimize their effects.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity testing of corn seeds as influenced by temperature and period of storage

Fessel

Vieira

Cruz³

et al. 2006

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effects of temperature (10, 20, 30, 20/10 and 30/10ºC) and period of storage on electrical conductivity (EC) in four seed lots of corn (Zea mays L.), as well as the mineral composition of the soaking solution. EC test determines indirectly the integrity of seed membrane systems, and is used for the assessment of seed vigor, because this test detects the seed deterioration process since its early phase. The research comprised determinations of water content, germination, accelerated aging (AA), cold (CT) and EC vigor tests, and determinations of Ca 2+ , Mg 2+ and K + release to the solution, after seed soaking of four corn seed lots. The evaluations were performed each four months during a period of 16 months. For statistical analysis, a completely randomized split plot design was used with eight replications. Except for seed lots stored at 10ºC, all vigor evaluations revealed a decline in vigor, but AA and CT showed more sensitiveness to declines of seed physiological quality than EC. Potassium was the main leached ion regardless of the storage temperature.

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Condutividade elétrica e teor de água inicial das sementes de soja

Cited by 88 publications

References 2 publications

Physiological potential of Brachiaria brizantha cv. Marandu seeds kept in contact with phosphatic fertilizers

Physiological potential of Brachiaria brizantha cv. Marandu seeds kept in contact with phosphatic fertilizers

Eletrical conductivity and deterioration of soybean seeds exposed to different storage conditions

Electrical conductivity testing of corn seeds as influenced by temperature and period of storage

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