Except that the Netherlands aren't rich because of their agriculture. They're rich and happend to be good at agriculture on the side as an added bonus.
Illinois is 100% agriculture. All the tech from Schaumburg and Naperville (W. Chicago) has been hollowed out. It's still relatively rich as a state ... You are forgetting that until recently in Brazil the USA had double the agricultural productivity of any place else on Earth...
The agricultural leaders of <anything> are countries that are nearly universally dirt-poor.