ABSTRACT
There have been few studies of the energy efciency of the different farming methods over time and in the same agroecosystem. These analyses have usually been made between different agroecosystems or between different farming methods, but synchronously. A long-term analysis in the same system makes it possible to discover the main changes that have occurred since the time when organic farming methods were of low intensity and until the present day. It should not be forgotten, in this regard, that historical analysis is a valuable tool to contrast the different uses made of energy in agrarian systems and to compare their efciency.
