A nice review paper about seed germination measurements was published by Ranal and Santana (2006) - 'How and why to measure the germination process?'- in Brazilian Journal of Botany. However, if you need help to calculate these measurements, you can use the instructions in Ranal et al. (2009) - 'Calculating germination measurements and organizing spreadsheets'-, which it was also published in Brazilian Journal of Botany.
The word speed has brought a series of difficulties in understanding aspects of seed germination. Currently, I have evaluated the percentage of normal seedlings after the germination test described in the rules of seed testing (AOSA, ISTA, and so on). Further attempts to evaluate the seed quality were not yet part of the rulers because of difficulties in obtaining reproducible standards. However, seed germination is a probabilistic event. In my studies (available in Researchgate), I fit the Weibull distribution with three parameters and the log of first derivative component suggests a better rate performance from a treatment unlike from the other. The method, however, require more equipments than usually is available in seed laboratories. Otherwise, variability is a good parameter of seed quality. Alternatively, I have printed box-and-whiskers plots to describe the responses (performance) where I can see the possible variability in the test when treatments are motive of comparison. Thus, I returned to the box-and-whiskers plots and you can access the literature by free in the Nature methods. The responses are consistent for consulting. The software Action 2.9 based on the R software can run in the Excel. I hope you enjoy my comments. Walter
Do you want to get the advanced seed germination measurement excel tool where you can calculate more then 10 seed germination related measurements in a very few simple steps. Visit the following link to watch the complete tutorial and download this tool from the link given in description of this video.
The equation to calculate germination percentage is GP = seeds germinated/total seeds x 100 . The germination rate provides a measure of the time course of seed germination. Germination rate is determined by calculating the GP at different time intervals after planting and then plotting these data.