The evidence of the Olmec civilization’s advanced agricultural system are:
Irrigation growing crops: Olmec civilization implemented irrigation systems in the coastal areas of the Gulf of Mexico in order to grow crops such as beans and corn.
Food surpluses: As they harvested the land twice a year, they generated food surpluses for the community. At the same time, food surpluses was possible due to the collection of plant food, sea food, among others.
Permanent settlements: Olmec civilization had permanents settlements with three main sities: San Lorenzo, La Venta and Laguna Los Cerros.