We do business in an area that has a lot of farms and farm production services and often its hard to determine if it's really a business or if it should be an AG loan.

For instance, loan to a company that makes chemical fertilizers to be used in farming.

AG loan?

To the best of my knowledge I would go with Business loan. Reg Z
8. Agricultural purpose. An agricultural purpose includes the planting, propagating, nurturing, harvesting, catching, storing, exhibiting, marketing, transporting, processing, or manufacturing of food, beverages (including alcoholic beverages), flowers, trees, livestock, poultry, bees, wildlife, fish, or shellfish by a natural person engaged in farming, fishing, or growing crops, flowers, trees, livestock, poultry, bees, or wildlife. The exemption also applies to a transaction involving real property that includes a dwelling (for example, the purchase of a farm with a homestead) if the transaction is primarily for agricultural purposes.