What college degree would best compliment having this type of farm?
I'm going to take a different tack on this. In this day and age, I think you would be hard-pressed to learn more from a college instructor about soil science and agronomy than you would from reading
Bryant Redhawk's and Joseph Lofthouse's posts. I am dead serious. I have a degree in Biology with heavy emphasis on botany. It was a slightly different type of education in that we expected half of the people to fail the
class every year, as a second-year (sophomore) we were using graduate texts in botany and doing tissue culture, and we were expected to be doing granted research as a third year (mine was in YACs- yeast artificial chromosomes). I slept very little, partied very seldom, and worked very very hard.
My degree taught me less than I have learned on here from these
volunteer instructors- way less. They have one thing most colleges don't have, which is practical implementation. I think this problem has gotten worse not better since I was in University. It did teach me the language but I seriously think you can do better practically with Botany in a Day and read EVERYTHING some of these mentors have written. I am a critical reader, always trying to find something wrong with stuff, and this is gold. I lose sleep on here, because these guys will save you years in failures. You will still have plenty of failures if you are doing something worthwhile but you will get to the interesting failures faster!
Free advice- worth what you pay for it. Find a degree that lets you have an income in a geographic area that has the attributes you are looking for. I also got a degree in engineering, which I would recommend like Ranson recommended Philosophy. It teaches you to dissect a problem into workable parts. This lets you fix machines, read technical documents, and often is a path to a paying job that lets you build your living situation with lower stress. Pick something you can't learn from the internet or that likely requires a degree/credential.
Do not pay for a degree that increases your stress from debt without giving you these attributes- I am distraught at the debt loads students are taking on for degrees- many worthless, without any idea how crushing debt is. Don't chase a name brand school- the people who care generally are useless. The education is for your benefit, to increase your productivity however you view that.