Funnily enough, half of my family are agricultural scientists and often lament the difference between how yield experiments are measured in the US are somewhat incompatible with those from Europe (and likely much of the world).  To be fair, this is beyond just &quot;units&quot; - in the US, yield is usually measured by volume, while elsewhere by weight.  The two are pretty difficult to convert between, as the weight of a bushel is both dependent on what specific produce it is, as well as its water content.  This leads to some loss of collaboration between the two camps.