I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Something is wrong with the seeding process. If the seed is good and you watered it in well and kept the area moist it should come up. Fertilizer can burn tender seedlings but most fail due to drying out in the germination process. I can't think of another likely cause of the problems. I suggest you rake the area to loosen the soil and try again with fresh seed. Don't add fertilizer and water lightly twice a day to keep the area moist for a couple of weeks.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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