Originally posted by lawnstudent
What percent of that N source is quick release? Most slow release N's are going to be useless at this time of year because they need warmer temps and moisture to break down and become available to turf. If mostly quick release N source, you risk burning turf at rates over 1 Lb. per 1,000 sq.ft.
46-0-0 is all quick release, the highest possible straight nitrogen slow release is a 39-0-0. At his time of year about the only way you will burn something is to seriously over apply or spill it. Applying 46-0-0 in a spreader while raining is not much different than spraying it. You can do either at 2lbs of N per 1000 or less with no burning.