I love your research! This history of hybrid corn seeds is not one I was familiar with. I suspect that may also true for many potential romance readers in the farm belt.
May I suggest working the bit about Henry Wallace and the then-potentially false promise of drought-defying hybrid corn seed into the dialogue? The family is discussing-debating, as differing generations of farm families often do when new “inventions” come about. (Usually the younger generation is ready to embrace, while the older is suspicious.)
The forced-out foreclosure story in your story is one many ag communities have faced. Dairy farmers in Wisconsin are going out of business now at a rate similar to the 1990s. Your story will touch a nerve.