It will probably not surprise you to hear that neither brother wants to spend one more nickel than is necessary. Speed is important here because conflict between partners destroys business value. Dissolution will require a mediator or attorneys and, unfortunately, it won't be cheap. Competent lawyers and mediators cost money. Appraisals cost money.
Courts cost money.
So do competent lawyers who work extensively with farms. These partners could begin with a mediator to help them set their individual goals for the dissolution and to seek an acceptable division. If they can't agree through mediation, what progress they've made can be discussed with lawyers representing each family. These lawyers can then be instructed to negotiate an acceptable settlement. Binding arbitration and litigation also are available if the above approaches fail, but prudent people prefer to avoid such extremes by emphasizing compromise and settlement.