i have lawn at home, it had small patches of dead grass. it receives sun almost 4 hours a day. i added to it fertilizer slow release NPK 15 almost 4 months ago with urea, then from 5 days i added urea again. and i made holes for aeration of the roots. but today i woke up and saw that my grass is dying and the dead patches are bigger and spreading, what shall i do for my garden grass to stay alive. plz help.

thank you