Lots of good Agricultural schools will have an Ag Economics or AgriBusiness program. Plus a full line of Ag, Range/ Wildlife, and AgMech programs. We have animal sciences at Tech, kind of a mix of biology and ag.

Colleges usually offer intro classes into a major, kind of an overview of what the program teaches and where you can go with it. Take a couple of these while you take care of all the general ed classes that everyone takes (math, english, poli sci, lab science, etc). The worst that happens is you just padded your GPA with a blow-off class, and maybe you find something you'd like. I had to take a one credit intro to general business, then a one-credit intro to accounting.

The most important part is just go. After a year at school you'll have a much better idea of what you want. Plus some good stories