There is a relationship, a correspondence, but it is shifted in time.
What relationship is there between the cereal yield in the world and the intensity of the Earth's magnetic field? To learn this, let us take the data of space monitoring of the magnetic field intensity in various regions of the Earth.
Swarm reveals Earth’s changing magnetism, ESA, 19 June 2014, http://www.esa.int/Our_Activities/Observing_the_Earth/Swarm/Swarm_reveals_Earth_s_changing_magnetism
We will also present a graph of the change in the Earth's rotational velocity on the day when the data of its magnetic field were obtained.
It can be seen that the intensity of the magnetic field over North America is higher than over Arab countries. Then maybe this is the reason why we have a difference in cereal growth rates?
We will recheck this by comparing cereal growth in the world (matches cereal growth in the USA) with the growth in Argentina and Brazil where the magnetic field intensity is much lower.
Let us compare it with cereal yield in the USA.
Yes, the trends of yield growth by years are relatively opposite. Although growth prevails in all countries. And correlation between these data is positive. Whereas each year fluctuations, deviations from mean values, anomalies are relatively opposite.
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