energy-for-land ratio

What is energy-for-land ratio?

energy-for-land ratio meaning in Enviromental Science terminology / glossary / dictionary is:
the amount of energy that can be produced per hectare of ecologically productive land. The units used are gigajoules per hectare and year, or GJ/ha/yr. For fossil fuel (calculated as CO2 assimilation) the ratio is 100 GJ/ha/yr.

 

reference: https://en.wikipedia.org/wiki/Glossary_of_environmental_science