Seedlings germinate and then die
I use a seed tray to germinate seeds, but my success isn't that great. I have a pretty good rate of germination, but the seedlings often die shortly after.
This latest effort I planted spinach, kale, chard, parsley, and parsnips. They all germinated, but within a week they started to yellow. I was fearful that it was fungus/rot so I removed the cover from the tray (I had it covered to retain moisture) to let some air circulate.
This seemed to make things worse. As it is, there are still seedlings that have survived, but compared to the number of plants that germinated it is maybe just 10%.
So where am I going wrong here?