Variação do vigor em função do tempo de armazenagem em sementes de azevém

Abstract

The inadequate physiological quality of ryegrass seeds has resulted in pastures with inadequate plant stand for ground cover and, above all, for forage exploration. In this sense, the present work aims to measure the variation of ryegrass seed vigor as a function of storage time. The starting point was the seed harvest (12/16/2019). The following periods of storage of seeds of 4 lots of the cultivar LE 284 were observed: 143, 223, 363, 497 days in a shed in the city of Pelotas/RS, with constant monitoring of temperature and humidity. Germination was an adequate reference to determine the physiological quality of ryegrass seeds throughout the storage period. The evaluation of germination at 143 days has already determined important differences in physiological quality between the lots. From this information, there was a linear drop in seed quality during the total storage period. The lots that showed high germination at this time (greater than 90%) maintained the physiological quality of the seed after 497 days of storage.