I think that the effect of Gypsum on seeds germination would vary according to plant species.For more details PLZ look at pending file:

Thank you, Mr. Ali Alayany for your answer.

Additionally to plant species, it also depends what kind of soil you are talking about. Soil, is one of the main factors to decide the use of gypsum. Ofcourse if the soil is problematic, gypsum can reclaim it and increase the relative germination percentage of any plant species.

Thank you, Mr. Abhijeet Singh for your answer.

I agree with Ali, gypsum affect seed germiation.

https://meetingorganizer.copernicus.org/EGU2017/EGU2017-15744.pdf

https://www.ncbi.nlm.nih.gov/pubmed/25756149

http://dergipark.gov.tr/download/article-file/122122

Gypsum can affect seed germination and plant development especially when salinity is an issue. Calcium can be very influential in the quality and viability of peanuts as an example. Under conditions that are not constricted by salinity gypsum would normally have little or no effect. Gypsum is very important for substituting for sodium in the saline environment. When humic acid is allowed to reach several 100 ppm and Calcium is at several times this the combination can counteract the salinity inhibitory effect. Reaction can be heavily influenced by plant adaptation type halo phytes and halo phobes react very differently to the saline environment. In a crop like maize if the soil test is over 1000 for Calcium there is little reason to be concerned about calcium insufficiency. Gypsum will be most beneficial in the saline environment and use of both organic amendment and gypsum can be very beneficial. Issues with Calcium may be related to Boron insufficiencies in many cases.

When you say 'germination' do you mean in the lab, in mineral or organic soils?

On heavy clay soils gypsum can help by flocculation clay particles which gives a better soil structure leading to reduced waterlogging which in turn can give better germination/ emergence. IE: Establishment!