Some good ways to kill nutgrass include changing the method of mowing and using a lawn food that contains a weed preventer. The latter helps prevent more growth of the nutgrass weeds.
One of the better ways to control and get rid of nutgrass is by mowing high. This is usually one of the two higher settings on the lawnmower. Each grass has its own height that is best for preventing these types of weeds. When the grass is higher, it overcrowds the weeds and nutgrass isn't able to grow. When feeding the lawn, use a product that contains a weed killer to get rid of the nutgrass.