Well you'll get 5.2 pounds N out of that bag (40*.13). But why a 1-1-1 ratio? Soil test?

You are going to fall short of 6 pounds. You needed 15-x-x. I am curriuos too why you chose a 1-1-1 ratio?

Thanks. Well good question on the ratio. I was trying for as close to 6 lbs I could find at the store and am not sure how much P&K I need. Some bags had zero P and the starters had a high P number. What do you suggest? (I have not done a soil test yet)

Another question. I just got done aerating in the rain. Forecast is light rain all day. I'm hesitant to seed right now because there is some puddling in my yard but should I go ahead and fertilize to facilitate "watering it in"?
Thanks!

Well the rain broke for a bit so I fertilized. I think though that I've under feed a bit. Should I just wait for the next feeding in 4-6 weeks? Should that one be only nitrogen?

There is nothing wrong about fertilizing slightly under a pound of nitrogen per 1000 sq ft. I think your ok with what you applied. The form of your nitrogen might not be the best for a lawn. If you didn't overseed this fall and have been mulch mowing you probably are ok with phosphorous and potassium. Try to find a slow release form of nitrogen for your next application. Best is to get a soil test and fertilize according to what your soil needs.

Please clarify. Are you saying the phosphorus and potassium might be harmful to my lawn? I don't get that as the "starter fertlilzers" have very high "P" numbers. I am overseeding tomorrow.

Pulled this from my cooperative extension 8/08 guide.

"A complete fertilizer with an N-P-K ratio of 4:1:2 or 4:1:3 can be used in lieu of a soil test".

This is for an "esteblished lawn" so I'm a bit confused what is optimal when overseeding since I'm fertilizing a "starter" AND "established" lawn.

Lawns use very little P & K. The "harm" is to the overall environment when you use too much P & K - like constantly applying 13-13-13. If you are sowing seed use a starter fertilizer otherwise base it on a good soil test or the 4:1:2 ratio.

Where I live, the soil already has plenty of P and K, so two of the most common fertilizers are 21-0-0 and 46-0-0 because all that is needed here is the N.

Ok, thanks. Lesson learned.