Author： Sakanoue S.
Publisher： International Seed Testing Association
ISSN： 1819-5717
Source： Seed Science and Technology, Vol.38, Iss.3, 2010-10, pp. : 612-623
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Abstract
An exponential distribution with a lag phase was considered for the concise and practical estimation of germination rates in the determination of the base temperature and thermal time required for seed germination. The germination time courses of nine herbage species (Italian ryegrass, perennial ryegrass, timothy, cocksfoot, tall fescue, Kentucky bluegrass, red clover, white clover, and lucerne) were examined at seven constant temperatures (5, 10, 15, 20, 25, 30, and 35°C), and then used for the nonlinear fitting of this distribution to estimate the mean and median durations until seed germination. The distribution showed excellent goodness of fit to the observed germination time course for any combination of herbage species and temperatures (root mean square of residuals, RMSR ≤ 0.0903). Two germination rates as the reciprocals of the estimated mean and median durations, which are denoted by
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