When should you add more fertilizer?

I planted a new lawn from seed three weeks ago. I used Scotts starter fertilizer, and the new lawn is looking great. Its a blend of Perennial Rye and Fescue. I was wondering when I should hit it with the next dose of fertilizer.

When the new grass is approximately two inches tall, fertilize. When the new grass reaches approximately 3 1/2 inches tall, begin mowing. Set the lawn mower at 2 1/2 inches. If weed control is needed, apply a selective herbicide, following manufacturers directions. Do not apply weed and feed fertilizers for at least 10 weeks.

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