Argentina's arable land is just 27% of what the USA has. Fact-checking myself... the USA has more arable land than Canada, Australia and Argentina combined. Russia has a lot, but the USA has the most. https://en.wikipedia.org/wiki/List_of_countries_by_arable_la...

Not sure where to find an aggregate growing days figure, but there's clearly less of them per arable surface area in Canada compared to the USA.