tell me about it...

Click here for more information and see table 1.2-12.

It's horticultural grade urea (which means pure, but not pure enough to use as a dietary supplement...don't ask..or a pharmaceutical).

Call it 46-0-0, give or take a tiny bit. Which makes it pretty easy to burn the lawn just by making a slight mistake, as urea is a fast source of nitrogen (days instead of the weeks from most organics). I don't recommend use of urea in summer except on Bermuda.

Click here for more information

That contains some stuff about urea. If moist but not watered in at higher pH levels, nitrogen losses can be severe in warm weather.

I use a slightly diluted urea source, Vigoro Super Green, with 1/3 slowly available nitrogen, in November as my winterizer. It's cold enough that losses are zip, my pH isn't that bad, and 35-0-5 (really, 23% nitrogen quickly available) isn't as likely to burn the lawn, particularly in cold weather.

so you go down to the feed store and buy 46-0-0, ya ought to know what your doing?
if you go to some farm&home store and get the 12-12-12 on sale, ya don't need to be a scientist or have the allusive accurate spreader?
sorry, I have problems with all this fertilizer science as I've done it different ways, used different products and never seen any drastic results, one way or the other. hmmm, maybe I wasn't drastic enough? only thing Milorganite did was smell for a couple of days. cracked corn, yadda, yadda.........

It is really hot fertilizer if we are talking about 46-0-0. I am not a cools season grass guy, but I do know to stay away from it in the summer as it will likely burn your cool season grass. I do know some cool season folks use in in mid to late fall as a last dose of nitrogen on cool season grasses.

As for warm season grasses I would not recommend it either with one or two exceptions, like a badly neglected lawn in desperate need of a shot of nitrogen, but even then caution has to be used. For example if there is any moisture on the grass like morning dew or from irrigation and you spread the stuff it will burn the grass before you can water it in. The granules will stick to the water droplets, and dissolve instantly The stuff is just too fast of a release and that hot. It has to be applied on dry turf and immediately watered in.

However what the stuff is really for is farmers fertilizing a hay field, corn, or other high nitrogen input cash crops.

I have used it at 1 and a quarter pounds per thousand on cool season grass right after the first hard freeze. It provides quick release nitrogen for immediate up take in to the crown of the grass plant for winter use and, to a larger degree, green up the next spring. A couple of university studies show it helps cool season grasses when applied that way.

Being careful to not over apply it, I've had great results doing that.

As other posters have suggested, other uses probably are more risk than they are worth. There are better and/or safer fertilizers for most other application needs. imho.