I need to find out days 75% germination for research of my colleague. I have record of germination count of number of wheat seedling every 2 days from 5th to 15 th days. Is there is any formula that I can apply in the excel sheet or formula to calculate the days to 75% germination?
Or any other method to calculate the days to 75% germination?
You simply record the day when 75% of seeds have germinated, assuming all seeds are viable (which can be tested prior to the experiment using the flotation test) :)
There are software packages available (also in Excel format) that plot the whole germination curve based on your data and with which you can calculate time needed to any given germination percentage. One example is the Germinator software developed by Wageningen Seed Science Center; see: https://www.wur.nl/en/Research-Results/Chair-groups/Plant-Sciences/Laboratory-of-Plant-Physiology/Wageningen-Seed-Lab/Resources/Germinator.htm
I'm not sure this specific package is still available (for free), but other similar packages exist as well.
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