Manutenção da umidade do substrato durante o teste de germinação de Brachiaria brizantha
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Data
2007-01-01
Autores
Gaspar-Oliveira, Carolina Maria [UNESP]
Martins, Cibele Chalita [UNESP]
Nakagawa, João [UNESP]
Tomaz, Camila de Aquino [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Tecnologia de Sementes (ABRATES)
Resumo
Para avaliar procedimentos para a manutenção da umidade do substrato durante o teste de germinação de Brachiaria brizantha. Estudou-se o efeito da posição das caixas plásticas na câmara de germinação sobre a perda de água semanal, testando-se nove posições verticais (bandejas) e três posições horizontais (porta, meio e fundo do germinador). Foi também avaliado o efeito de procedimentos para manter a umidade do substrato, sobre a germinação, a perda de água semanal e o tempo despendido para a instalação do teste. Os procedimentos testados foram: (a) vedação da caixa plástica com vaselina, (b) vedação com saco plástico dobrado em quatro e colocado entre a tampa e a caixa, (c) colocação da caixa tampada dentro de saco plástico, (d) espuma sob o papel de germinação e (e) testemunha, caixa apenas tampada. Concluiu-se que a câmara de germinação promove a desidratação desigual do substrato conforme a posição das caixas; aquelas localizadas na primeira bandeja superior são as mais prejudicadas. Entre os procedimentos, a vedação com vaselina, a colocação da caixa dentro de saco plástico e a vedação com saco plástico dobrado em quatro entre a tampa e a caixa são eficientes na manutenção da umidade do substrato em taxas que não alteram os resultados do teste de germinação de B. brizantha; os dois últimos procedimentos são os mais rápidos e práticos, adaptando-se à rotina de um laboratório de análise de sementes.
The research aimed to evaluate procedures for maintaining paper substrate moisture during Brachiaria brizantha germination test. So, the effect of plastic boxes position in a germination cabinet on weekly loss of substrate moisture was determined; nine vertical positions (trays) and three horizontal positions on the trays (front door, middle and back of the cabinet) were evaluated. The efficiency of some procedures for maintaining substrate moisture on germination percentage, weekly loss of substrate moisture and time spent for setting up the test was also studied. The procedures were as follows: (a) sealing the box by spreading vaseline in the surfaces between the lid and the box, (b) sealing the box by placing a plastic foil folded twice between the lid and the box, (c) placing the box, with the lid on, inside a plastic bag, (d) placing a polyethylene foam at the bottom of the box under the paper substrate and putting the lid on, and (e) control treatment, with just the lid on, without subsequent watering. It was concluded that the germination cabinet causes different dehydration rates of the substrates, and the boxes located on the first tray at the top are the most affected. Among the procedures, sealing the box with vaseline, placing the box inside a plastic bag and sealing the box by placing a plastic bag folded twice, are efficient for maintaining the paper substrate moisture at adequate levels in such a way that the results of Brachiaria brizantha germination tests are not altered; the last two mentioned procedures are faster and more practical, being easily adaptable to routine tests of a seed laboratory.
The research aimed to evaluate procedures for maintaining paper substrate moisture during Brachiaria brizantha germination test. So, the effect of plastic boxes position in a germination cabinet on weekly loss of substrate moisture was determined; nine vertical positions (trays) and three horizontal positions on the trays (front door, middle and back of the cabinet) were evaluated. The efficiency of some procedures for maintaining substrate moisture on germination percentage, weekly loss of substrate moisture and time spent for setting up the test was also studied. The procedures were as follows: (a) sealing the box by spreading vaseline in the surfaces between the lid and the box, (b) sealing the box by placing a plastic foil folded twice between the lid and the box, (c) placing the box, with the lid on, inside a plastic bag, (d) placing a polyethylene foam at the bottom of the box under the paper substrate and putting the lid on, and (e) control treatment, with just the lid on, without subsequent watering. It was concluded that the germination cabinet causes different dehydration rates of the substrates, and the boxes located on the first tray at the top are the most affected. Among the procedures, sealing the box with vaseline, placing the box inside a plastic bag and sealing the box by placing a plastic bag folded twice, are efficient for maintaining the paper substrate moisture at adequate levels in such a way that the results of Brachiaria brizantha germination tests are not altered; the last two mentioned procedures are faster and more practical, being easily adaptable to routine tests of a seed laboratory.
Descrição
Palavras-chave
Germinador, perda de água, sementes, braquiária, germinator, water loss, seeds, signalgrass
Como citar
Revista Brasileira de Sementes. Associação Brasileira de Tecnologia de Sementes, v. 29, n. 3, p. 52-60, 2007.