A recent paper in Agricultural Systems looks at what’s happened to the potential yields of eight crops (winter wheat, spring barley, maize, winter rapeseed, potato, sugar beet, pulses and sunflower) in Europe from 1976 to 2005. Italy and central and eastern Europe have been the big losers (left), probably due to higher temperature increases, sometimes in combination with lower radiation values.
And the British Islands have been the big winners (right), due to to longer period during which temperature is optimum for CO2 assimilation, sometimes in combination with higher radiation levels. That, of course, cannot last forever, though.