How did trees usually grow in Argentina, Brazil and the USA?
The trees have relatively opposite indicators, the same as in the case of cereals. At the same time, one must take into account the difference in temperature and climate between these countries.
Let us compare these graphs with the Earth's rotational velocity.
There is the relationship between the tree growth rates and the Earth's rotational velocity: tree growth in Brazil is higher with at the slowdown of rotational velocity. In the USA trees grow better at the growth of the Earth's rotational velocity.
Yes, trees in the USA and Brazil, like cereals, grow with relatively opposite trends with respect to the Earth's rotational velocity.
So what, is the reason in the Earth's magnetic field?
Most likely this is a superposition of many factors, including genetic ones. This conclusion is based upon the analysis of high-yielding breeds of cows that were kept on the same farm. Milk yields there varied depending on the Earth's magnetic field intensity in the region where they were. They were located in one place, but their genetics was different. The statistics is impressive – more than a thousand cows of each breed.
See V.A. Afanasiev, S.M. Chibisov, A.A. Nikishov, A.Yu. Shitikov. Productivity of high-yielding cows of black-motley and red breeds at various helio-geomagnetic activity.
One of the conclusions of this study:
"Highly productive animals, obviously, possess more stable metabolism than average over the herd. Therefore, they, apparently, were less exposed to the influence of the Sun, but were more sensitive to the Earth's magnetic field intensity".
The most important final conclusions of this study are the following:
"1. The experiment revealed a strong relationship between the provided… indicators of annual average productivity and annual average geomagnetic activity data (Ar – index).
2. A negative value of r = from -0.37 to -0.74 was determined at p ≥ 0.95, the relationship between the provided productivity of red breed animals and geomagnetic activity, which can be interpreted as a trend of decreasing productivity at the increase of geomagnetic activity, except 3-4 years close to the change of solar magnetic poles, i.e. the years of maximum solar activity.
3. The correlation between the adjusted productivity of black-motley breed and geomagnetic activity is positive with r = from 0.53 to 0.74 at p ≥ 0.975, which can be interpreted as a trend of increasing productivity at the increase of geomagnetic activity.