I seeded a lawn about 5 weeks ago. We installed about 5 inches of top soil. We had the irrigation hit it 3 times a day for 6 minutes each time. For the first 3 weeks it came in strong. For the last 2, it has no grown at all. What should i do. I used the same seed, from the same supplier i always use. I have never had this issue before. Do i hit it up with starter fert again? Please give me some good advice!