  50 year-long time series from a Long Term Agronomic Experiment have been used
to to investigate the effects of climate change on yields of Wheat and Maize.
Trends and fluctuations, useful to estimate production forecasts and related
risks are compared to national ones, a classical regional climatic index as
Western Mediterranean Oscillation Index, and a global one given by Sun Spot
Number. Data, denoised by EMD and SSA, show how SSN oscillations slowing down
in the last decades, affects regional scale dynamics, where in the last two
decades a range of fluctuations (7-16 years) are also evident. Both signals
reflects on yield fluctuations of Wheat and Maize both a national and local
level.
