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Research was initiated to investigate early germination and establishment characteristics of perennial ryegrass (PR, Lolium perenne L.). An alternative condition was applied in Experiment I with 8-hr light at 25oC and 16-hr dark at 15oC (ISTA condition). Experiment II was conducted under 5oC to 25oC (natural condition). Significant differences were observed in germination percentage, germination speed and germination peak time. Seed germinating vigor was 66.00 to 93.75% under ISTA and 66.25 to 93.50% under natural conditions. Germination speed, measured as days to germination of 50% through 90%, was much faster with "Pennant II", "Brightstar II", "Sonata" and "Accent II" under ISTA conditions. But it was faster only with "Pennant II" and "Brightstar II" under natural conditions. Germination peak time ranged 1.48 to 5.65 days under ISTA, while 2.17 to 10.63 days under natural conditions. Regardless of growing conditions, the shortest cultivars in peak time were "Sonata", "Pennant II", and "Brightstar II" and the longest one "Revenge GLX". Considering germinating vigor, early germination speed and germination peak time, "Pennant II", "Brightstar II", "Sonata" and "Accent II" were regarded as excellent cultivars under ISTA conditions, while "Pennant II" and "Brightstar II" under natural conditions.

weed and turfgrass science

Comparison of Seed Germinating Vigor, Early Germination Speed and Germination Peak Time in Perennial Ryegrass Cultivars under Different Germination Conditions