Determination of methodologies for evaluating the physiological quality of seeds of annual ryegrass (Lolium multiflorum Lam.)

As metodologias dispon??veis para a caracteriza????o da qualidade de sementes de esp??cies forrageiras de clima temperado n??o s??o bem espec??ficas, e na sua grande maioria s??o adaptadas daquelas usadas para as sementes das grandes culturas, o que tem levado ?? obten????o de resultados desuniformes e pouco confi??veis. Este trabalho teve como objetivo a busca do estabelecimento de metodologias que permitam avaliar de forma precisa a qualidade de diferentes lotes de sementes de azev??m anual. Para isso, foram testadas varia????es metodol??gicas de testes comumente empregados para sementes de outras esp??cies e avaliado o desempenho de um m??todo alternativo, buscando detectar uma metodologia que permitisse melhor demonstrar o potencial fisiol??gico de campo das sementes. Utilizaram-se sementes de azev??m anual, representadas por quatro lotes. As sementes foram avaliadas atrav??s dos testes de determina????o do teor de ??gua, pureza f??sica, peso de mil sementes, germina????o, primeira contagem de germina????o, envelhecimento acelerado, condutividade el??trica, emerg??ncia de pl??ntulas em bandeja com areia e ??ndice de velocidade de emerg??ncia (IVE). De acordo com os resultados obtidos, concluiu-se que o teste de condutividade el??trica ?? promissor para a avalia????o do vigor de sementes de azev??m anual, sendo que a combina????o 100 sementes/25mL permite a separa????o de lotes em diferentes n??veis de vigor. ?? poss??vel determinar o vigor de sementes de azev??m anual pelo teste de envelhecimento acelerado utilizando-se 41??C/48h e 42??C/72h.The methods available to characterize the quality of forage seeds of temperate climate are not very specific, and mostly used are those adapted for the seeds of the most crops, which has led to achieving results and little disform reliable. This study aimed to seek the establishment of methodologies to assess accurately the quality of different seed lots of annual ryegrass. For that were tested methodological variations of tests commonly used for other crops seeds and evaluated the performance of an alternative method, trying to detect an alternative that would allow better demonstrate the physiological field and seed storage. We used annual ryegrass, represented by four lots. Seeds were evaluated using the tests for determining the water content, physical purity, thousand seed weight, germination, first count germination, accelerated aging and electrical conductivity, seedling emergence in sand tray, rate of emergence (IVE). According to the results, we concluded that the electrical conductivity test is promising for evaluating the effect of annual ryegrass. The use of combination 100 seeds/25mL the electrical conductivity test, allows the separation of lots at different levels of force. You can determine the effect of annual ryegrass seeds by accelerated aging test using 41??C/48h and 42??C/72h