I'm sure this has been covered but our country road was paved about a month ago and they sprayed the sides with hydro seed. It's to perfect not to feed so I hope I can. Please hurry because I'm weedeating now
They might have sprayed any number of things on the ground prior to spraying that hydro seed down. Weed killers, pre-emergent fertilizers...etc.
I did a very quick search, this was the first entry:
Apr 22, 2015 · HydroSeeding is a process where seed and any combination of fertilizer, lime, biostimulants, moisture retention polymers, tackifiers, and other additives are combined with water and a hydroseeding mulch to form a slurry that is sprayed onto the ground to establish vegetation and control erosion.