1. Field surface
The provision as it is printed, and everything on Ruleside that turns on it.
The field of play must be a wholly natural or, if competition rules permit, a wholly artificial playing surface except where competition rules permit an integrated combination of artificial and natural materials (hybrid system).
Answered differently by competition 1
This clause hands the answer to whoever runs the competition, so it has more than one.
The Laws of the Game are published by The IFAB and quoted here for the purpose of explaining the decisions on this site. Ruleside is not affiliated with The IFAB or FIFA. Every clause of The Field of Play that Ruleside cites.