Rapid changes in farm practices, largely caused by labor shortages and favorable price-cost relationships, have characterized South Dakota agriculture during the last decade. These changes have raised the questions as to how well they pay. The farmer is always faced with the problem of determining the profitableness of changes in farm practices. Currently, the dollar value of irrigation, soil conservation practices, and various livestock systems of farming are important problems. How much if any of these practices will pay on a particular farm? The answer to this question depends upon the cost of the practice as compared with the benefit of the practice for the entire farm. Neither cost nor gross profit alone tells the story. The effect of ...