Seems like everyone down here cheated and used something iron-based instead of nitrogen for the 3rd and last zoysia/bermuda fertilization. So we are thinking of doing the same next summer, just to survive. What would be a reason not to do this if the lawns are already nice and thickened by August, when green grass is all that is desired anyway? And what would be a good inexpensive iron-based product to use? Thanks for any input!