Where in CA are you? What kind of grass is it?

bpgreen you must be busy or tired or both or something.

Sac=Sacramento, CA and a blend of bluegrass and fescue.

Im not very familiar with cool season grasses but I would say a to "lightly" fertilize the new seedlings/sprouts.

I don't know how I missed that. Duh.

It's too late for this, but I would not have pulled the yellow grass. It may have come back on its own.

I agree with skoot cat. Don't fertilize now, unless you use something slow release (maybe organic) and fertilize at a lower than normal rate. The seed you put down will have a tough time making it, but the bluegrass in the sod should fill in hte bare patches unless they're huge.

Sacramento huh? Gets really hot and dry there in summer. Doubt your seed will take to good. Might be a good idea to wait till Fall.

OP, do you have irrigation? If so, you can fertilize BUT at half the rate. Water only between 4 to 7 am to prevent stress.

The cool night time temperatures (upper 50's) in Sacramento during the summer really help cool season grasses recharge.