I am writing a manuscript on the presence of fungal species on a specific sample. How can I express their growth rate on specific period of time in chart or diagram?
In mycology, Petri-dishes of 10 cm with 12 ml culture medium , are taken to measure rate of growth. The fungus under test is inoculated at the centre of the dish. Observe the time (days) taken to cover the plate.. Fast growing fungi cover in 2-3 days; slow growing take even more than 4 weeks time. This we can express while describing rate of growth.
Use simple linear regression formula (y=mx + a) which can be got easily be charting your data ( at least 2 daily diameter measurement, if more will be better) in scatter plot with linear regression option by excel. Now "m" is the growth rate. I hope this will help.