A football pitch (also known as a soccer field) is the playing surface for the game of association football. Grass is the normal surface of play, although artificial turf may sometimes be used especially in locations where maintenance of grass may be difficult due to inclement weather. This may include areas where it is very wet, causing the grass to deteriorate rapidly; where it is very dry, causing the grass to die; and where the turf is under heavy use. Some leagues and football associations have specifically prohibited artificial surfaces due to injury concerns and require teams' home stadia to have grass pitches. Football can also be played on a dirt or gravel field. In most parts of the world, dirt is used only for casual recreational play.

Source: Wikipedia