European size unit
ESU
Definition
The European Size Unit (ESU) is a unit used to measure standard gross margin (SGM). An ESU is equivalent to 1.5 hectares of wheat.
This concept is no longer used from the 2010 agricultural census.
Side note
Source : service de la statistique et de la prospective (SSP), ministère chargé de l'agriculture (site : http://agreste.agriculture.gouv.fr)