said by Pacrat: You're really not going to be able to tell if you did any damage 'til the grass enters its growing season. Normally, (N) nitrogen should be applied at a rate of 1#/1,000sq.ft. A 30# bag of 8-24-24 contains about 2.4 pounds of available nitrogen... not nearly enough to burn 10,000 sq.ft. of yard.
Remember what the the items are for:
Nitrogen (N) for growth
Phosphorus (P) for root development
Postassium (K) for disease resistence
Generally, your lawn requires much less K or P than do crop fields... what you used was an agricultural fertilizer, not a grass/sod fertilizer. You applied way too much phosphorus and potassium, but not nearly enough nitrogen. Nitrogen is the villain in burning grass plants... You should never really apply as much P or K as you do N. A balanced fertilizer such as 12-12-12 or 16-16-16 is as radical as you should ever get. Most lawn fertilizers are considerably higher in N than either of the other two elements, because that's what the grass needs to grow.
Bottom line... you didn't burn your lawn out, but you shouldn't use that formulation again for a healthy, green lawn. 30-5-5 is more than adequate for your needs.
Thank you and everyone for your help. I'd like to show my math in terms of determining my actual lawn size:
Double Lot: 100' x 127' = 12,700 sq.ft
Living quarters: 1365 sq.ft.
Garage: 528 sq.ft
Driveway: 700 sq.ft
Deck: 80 sq.ft
Misc.: 27 sq.ft.
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Lawn = 10,000 Sq.ft
The fertilizer came in 50# bag. I estimate that I poured out, let's say
just to be safe, 40# of the bag into Scotts spreader....one of those
small $34 spreaders. Did not fill the hopper to the brim, but it was filled up pretty good. Set the spreader on 2.5 and tried to keep moving. The front yard is on good slope so I got a workout.
So that would be about 3.2 Lbs of Nitrogen on 10,000 Sq.ft given that my spreading technique was even handed.
Pacrat: I'll remember your advice when I fertilize again....perhaps in a month?