Answer: How perplexing! Since the ground isn't overly moist we can probably rule out rotting, and since you've pregerminated them we know the seeds are fine. Innoculant should also help. At this point I would suspect a critter has been stealing them -- probably birds. (In my garden they will dig them up!) I have also seen cases where bunnies have pulled them right out of the ground just as they germinated and there is also a possibility of slugs if the weather has warmed enough. Maybe you will be able to figure it out with some detective work.
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