The StrathAyr natural all weather turf system was invented in the 1970s . StrathAry turf is grown on a farm, cut in rolls and then the soil is washed out of its roots. The turf is laid on plastic mesh with beds of sand and gravel and drainage pipes below. Buried sensing devices check that turf is neither too wet nor too dry. Sports fields laid with StrathAyr turf can be easily repaired if damaged during games. In 1992 the Melbourne Cricket Ground was re-laid with StrathAyr turf.