Land ploughed and tilled, but left unsown for a season to allow it to recuperate. In Europe, it is associated with the medieval three-field system. It is used in some modern crop rotations and in countries that do not have access to fertilizers to maintain soil fertility.
The ‘Sun of May’ was added in 1818. The blue bands are a shade known as ‘celeste’, said to be the colour of the sky which inspired Argentine revolutionary Manuel Belgrano before battle. Effective date: 16 August 1985.