"Tonnes per hectare" is a measurement of crop yield that indicates how much of a crop is produced on a given area of land. One hectare is roughly the size of a football field (10,000 square meters), and one tonne equals 1,000 kilograms. For example, if a field produces 5 tonnes per hectare of maize, it means that 5 tonnes of maize are harvested from an area the size of a football field. This measurement helps in understanding the productivity of land for different crops.