• Data reference period
• Geographic localization (Agrarian region)
• Tractor ownership regime

• AGRICULTURAL HOLDING:  Technical-economic unit that uses common production factors such as labour, machinery, facilities, land, among others, fulfilling the following four conditions: 1) yield agricultural products or maintain, in good agricultural and environmental conditions, the lands that are no longer used for productive purposes; 2) reach or exceed a certain size (in area or number of animals); 3) be subject to a single management; 4) be located in a well-defined and identifiable area.
• AGRICULTURAL TRACTOR:  Motor vehicle designed exclusively or primarily for agricultural purposes whether or not permitted to use roads opened to public traffic.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

(Total number of agricultural holdings with tractors/ Total number of agricultural holdings)*100