end of the grass blade leaving them ragged. these later turn brown giving the lawn a dried out look.
in the heat of summer make sure you have a regular and frequent watering pattern. watching the grass turn yellow in very hot weather (a natural reaction) over a period of 2 to 3 weeks and then deciding to give it a good sprinkling is probably the worst thing you can do. the chances are you will only give a surface watering which will not penetrate the soil to any great extent. as a result the roots all turn upward to get to the water, which is fine until the next hot 