2nd Cut Fizzled Out?

My orchard grass looks like death warmed over! After first cutting I applied 100 lbs to the acre of 40-0-0-10s and had about 3/4” of rain a day or two afterwards, so I figured I was off to a good start but that was about the only rain in 4 weeks that it got and temps have been in the upper 80’s to low 90’s most of that time, so needless to say it looks pretty burnt. There is a few lower spots where it tried to grow but for the most part it’s 5-6” high and crispy. Should I try and mow it to get it growing again once it rains or just leave it be?

2nd Cut Fizzled Out?