Efeito do retardamento da secagem na qualidade fisiológica de sementes armazenadas de azevém anual

Eichelberger, L.; Peske, Silmar Teichert; Moraes, Dário Munt de

doi:10.1590/s0100-204x2003000500013

Cited by 3 publications

(1 citation statement)

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“…33, nº 4 p. 721 -731, 2011 capacidade germinativa das sementes de pinhão manso. Tal fato foi também constatado por outros, com feijão (Ahrens e Lolatto, 1995) e com soja (Miranda et al, 1999); com azevém (Eichelberger et al, 2003) Moshkin (1986) afirma que a temperatura de secagem suportada pela massa de sementes não deve ser superior a 45 °C.…”

Section: Resultsunclassified

Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Zonta

Araújo

Araújo³

2011

Rev. bras. sementes

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LuiZ antônio dos santos dias 3 RESUMO -Objetivou-se no presente trabalho avaliar diferentes tipos de secagem e seus efeitos na qualidade fisiológica de sementes de pinhão manso (Jatropha curcas L.). As sementes, com teor de água de 32%, foram secas à sombra até 9,9%, ao sol até 8,8% e em estufa de circulação forçada às temperaturas de 33 °C até 8,5% e 43 °C até 8,3% A qualidade fisiológica das sementes foi avaliada pelos testes de germinação, primeira contagem de germinação, condutividade elétrica, envelhecimento acelerado, emergência em areia e índice de velocidade de emergência. A temperatura de 43 °C proporcionou secagem mais rápida das sementes, com duração de 42 horas. Nas secagens a 33 °C, ao sol e a sombra, este período foi mais prolongado, com 54, 144 e 456 horas, respectivamente. A secagem à sombra proporcionou redução na qualidade fisiológica das sementes. As sementes secadas ao sol ou à temperatura de 33 °C não diferiram entre si quanto à qualidade fisiológica e foram superiores àquelas secadas à sombra; entretanto, a germinação foi inferior àquelas secadas a 43 °C, a partir dos 180 dias de armazenamento. A secagem à temperatura de 43 °C não afetou a germinação das sementes e reduziu ligeiramente o vigor, mesmo após 270 dias de armazenamento. Como a maior temperatura utilizada não afetou a germinação das sementes, isto sugere ter sido o tempo gasto na secagem das sementes é determinante para sua conservação. Sementes de pinhão manso podem ser secadas ao sol e sob temperaturas de 33 e 43 °C; temperatura de 43 °C proporciona menor tempo de secagem e melhor germinação e vigor de sementes de pinhão manso; secagem à sombra é prejudicial à qualidade de sementes de pinhão manso.Termos para indexação: Jatropha curcas L., germinação, deterioração, qualidade fisiológica, conservação EFFECTS OF DIFFERENT TYPES OF DRYING ON THE PHYSIOLOGICAL QUALITY OF PHYSIC NUT SEEDSABSTRACT -This study aimed to evaluate different types of drying and their effects on the physiological quality of physic nut seeds (Jatropha curcas L.). Seeds with 32% water content were dried in the shade to 9.9 %, in the sun to 8.8 %, in a forced circulation oven, at a temperature of 33 °C, to 8.5 % and at 43 °C to 8.3 % water content. The physiological seed quality was evaluated by germination, first count of germination, electrical conductivity and accelerated aging tests, as well as the seedling emergence index and emergence rate. A temperature of 43 °C dries seeds faster and lasts 42 hours. The drying period at 33 °C in the sun and shade lasted longer, at 54, 144 and 456 hours respectively. Shade drying caused an immediate reduction in physiological seed quality. Those seeds dried in the sun or at a temperature of 33 °C showed no differences regarding physiological status and were better than those dried in the shade. However, germination was

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Section: Resultsunclassified

Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Zonta

Araújo

Araújo³

2011

Rev. bras. sementes

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Drying of meadow fescue seeds of different moisture contents: Changes in dormancy and germination

Stanisavljević¹,

Milenković²,

Djokic³

et al. 2013

PLANT SOIL ENVIRON

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In the past few years in Europe grass seed production declines. This tendency is especially pronounced in meadow fescue. Seed shedding and therefore yield losses are the problem in seed production. This can be reduced if seed of higher moisture contents is harvested. The impacts of drying temperatures of 70, 60, 50, 40 and 22°C on changes in dormancy and germination of seed harvested with moisture contents of 45, 35 and 25% were observed in the present study. The analysis was done immediately after seed drying, then three months later and eight months later. Seeds with the moisture content of 45% that were dried at 70°C were not dormant at all after harvest, but seeds were damaged, which resulted in reduced germination. Drying temperatures of 40°C and 50°C resulted in maximum germination of seed harvested with 45% moisture after three months. After eight months the best germination of all seeds was obtained at 22°C and 40°C. The seed ageing test confirmed faster deterioration of seeds harvested with higher moisture contents. Seed harvested with 25% moisture and dried at 22°C is the most suitable seed for longer storage.

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Crambe seeds quality during storage in several conditions

lian¹,

Resende²,

Douglas³

et al. 2013

Afr. J. Agric. Res.

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Crambe abyssinica seeds are spherical and surrounded by a structure called the pericarp. The basic function of the pericarp is to protect the grains against abrasion and shocks, to function as a barrier against microorganisms and to allow the seeds to be stored for long periods of time. The aim of this study was to evaluate the C. abyssinica seed quality stored under different environmental conditions without the pericarp. Crambe seed with 6.5% w.b. moisture content were used. Measurements for the electrical conductivity, water uptake, germination percentage and index of germination velocity (IGV) were performed at the beginning of the experiment (zero months) and every two months for a period of a year. The seed were stored under three environmental conditions: Room temperature (26±3°C, 55±12% relative humidity [RH]), a cold room (5±1°C, 79±5% RH) or a climate-controlled chamber (18±1°C, 53±7% RH). The climate-controlled chamber maintained the best quality in the crambe seed, with better germination percentage and IGV than the other conditions. The storage conditions promoted decrease in the crambe seed quality. It was possibly visualize that there was a loss of dry matter during storage, especially lipids adhered in Kraft paper bags.

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Efeito do retardamento da secagem na qualidade fisiológica de sementes armazenadas de azevém anual

Cited by 3 publications

References 6 publications

Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Diferentes tipos de secagem: efeitos na qualidade fisiológica de sementes de pinhão manso

Drying of meadow fescue seeds of different moisture contents: Changes in dormancy and germination

Crambe seeds quality during storage in several conditions

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