Crab and Nut Grass taking over. Help!

Hi, I have about 2 acres of lawn, Over the last few years I have had to dig up certain areas, for different projects, After re planting the lawn in those spots I seem to have a lot of Crab Grass and Nut Grass, The are some big patches where the crab grass is thick. I am getting annoyed with it since it grows so much faster then the normal grass. What are my options?