Did you apply any fertilizer prior to or after the sod installed? Typically a starter fertilizer is a good choice even with new sod. So if you skipped any fertilizer application I think you would be safe to go that route. Fertilizing in the hottest periods of summer is sometimes not recommended for established lawns but if you have brand new sod or seed you need to give it a kick start.bandwgn09 said:
If you already applied starter fertilizer I would consider looking into other factors (mowing or irrigation practices first) and then maybe in another week or so you might apply a general turf fertilizer or milorganite
What's your irrigation schedule like?
Is that the worst area of the whole project? If so I would say it looks like the new sod is going pretty well.
Is the area level? If not best advice might be to raise the HOC until next season just to let the grass recover and stay healthy until you can get the area more level.