OK, so I have been struggling with this lawn since March (we moved in over the fall). Long story short, I just put lime down and used a company to spray the crabgrass (it was heavy in the back). I water for about two hours at least 3x a week. Now, I am noticing the grass is starting to turn brown (heat stress maybe?). It's been so hot here in NJ. I mow it high, about 3" once a week. I have not fertilized since May. Is there anything I could do to stop this "browning" process? It's not grubs or anything like that, I think it's going dormant to protect itself from the heat. Any fertilizers or anything I could do?