I just had new 419 Bermuda sod installed in my backyard on Monday that was mostly brown when installed as the sod farm delivered it last Thursday during a heavy rain here in DFW and the installation company wasn't able to get it done until Monday. I have been watering it 2 times a day so far for 15 minutes each zone which equates to 1 inch of water. When should I apply my first application of fertilizer? I have a bag of Dr. Iron which I believe is 20% iron. Would it be ok, to drop some of this down to help with the color?