Originally Posted by foreplease
Milorganite, like other organic fertilizers, works best at soil temps above 70. Ammonium sulfate, on the other hand, is a great cool weather choice as someone mentioned above. Both and dozens more are in our toolboxes, affording each of us a lot of latitude and discretion.
If your turf uses up a 1/2 of a pound of Ammonium Sulfate before the ground freezes then it may have been a good decision...
An important 'toolbox' question is:
"What happens to Ammonium Sulfate if it just sits on the frozen turf for 5 months???"