I have heard from a couple farmers that the seeds from the crop is slightly inferior to the originally planted seeds. When replanted their seeds are slightly more inferior. I do not know if that is actually true. I am trying an experiment with beans to see if it is true. I will know in a few years.
I don’t get what you’re saying. Isn’t that what’s done anyway?
If you’re talking about hybrids they tend to lose most of their vigor in a few generations if they reproduce at all. New seed each year overcomes that problem.