What is the theoretical ranges of PhotoPeriod_crit1, PhotoPeriod_crit2, PhotoSlope, and Rue for maize ?

[Chuanwei-zhang-ucas]

I want to know the theoretical ranges of these parameters, and it seems like the change of photeoperiod2 is not sensitive to phenology and yield, how to explain it ?

[jbrider]

There is a link in this article to a document that describes how the sorghum model works in Apsim.
https://www.apsim.info/apsim-model/description-of-crop-growth-and-development-framework-in-apsim-crop-models/
The Maize model in classic is based on the same concepts - with some changes in parameters, so it should be a good starting place for you.