Plant growth analysis
- If you have a moderate number of harvests (perhaps five to ten) you should consider using stepwise polynomial growth curves. A 1974 paper in the Journal of Applied Ecology described a method which has been successfully used hundreds of times. There is now a Windows-based tool which you can use to apply this method.
Go here to download all the necessary files.
If you have more than about ten harvests you should consider using splined polynomial growth curves. There is a DOS-type application available for obtaining plant growth parameters from spline curves: go here to download all the necessary files. This application also delivers second derivatives from the fitted splines (the rates of change of the rates of change).