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Sowing depth of annual ryegrass seed on different substrates as a vigor test
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Sowing depth of annual ryegrass seed on different substrates as a vigor test
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Journal Article
Sowing depth of annual ryegrass seed on different substrates as a vigor test
2019
Overview
Annual ryegrass seeds having low physiological quality can lead to the formation of pastures with undesirable plant stands for soil cover and forage utilization pastures. Thus, the objective of this study was proposing a vigor test to classify annual ryegrass seeds. For that, different sowing depths (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 cm) over three substrates (sand, coconut fiber, and carbonized rice husk) were tested to differentiate the physiological quality of four seed lots of annual ryegrass cv. BRS Ponteio having similarities in germination and moisture. The seed lots were classified according to vigor through the field seedling emergence (FSE), 1,000-seeds weight, saturated salt accelerated aging, and germination first count. The 2.5 cm of sand sowing depth and 3.0 cm of coconut fiber sowing depth provided separation of seed lots in similar groups of those reported to FSE test through the seedling emergence and speed of seedling emergence tests.
Resumo: Sementes de azevém com baixa qualidade fisiológica têm resultado em pastagens com inadequado estande de plantas para a cobertura do solo e, sobretudo, para a exploração forrageira. Neste sentido, o presente trabalho teve como objetivo propor um teste de vigor para sementes de azevém anual. Foram testadas profundidades de semeadura (0,5; 1,0; 1,5; 2,0; 2,5 e 3 cm) em três substratos (areia, fibra de coco e casca de arroz carbonizada) para diferenciar a qualidade fisiológica de quatro lotes de sementes da cultivar BRS Ponteio que apresentaram semelhança no teste de germinação e umidade. Os lotes foram classificados quanto ao vigor pelos testes de emergência em campo, peso de mil sementes, envelhecimento acelerado e primeira contagem da germinação. A profundidade de semeadura em substratos de areia e fibra de coco permitiu a determinação do vigor em sementes de azevém anual (de maneira similar ao observado no teste de germinação no campo), pela porcentagem de emergência e pelo índice de velocidade de emergência de plântulas semeadas em areia a 2,5 e em fibra de coco a 3,0 cm de profundidade de semeadura.
Publisher
Abrates - Associação Brasileira de Tecnologia de Sementes,ABRATES - Associação Brasileira de Tecnologia de Sementes,Associação Brasileira de Tecnologia de Sementes
Subject
