Calculating field capacities is just part of the overall concept of farm machinery management. Successful farm machinery management does not guarantee a profit, but machinery costs are a major expense and they must be monitored and managed. Therefore, the efficient use of farm machinery starts with determining working capacity in conjunction with the amount of work to be accomplished in a timely manner.
Hancock, J. N.; Swetnam, Larry D.; and Benson, F. J., "Calculating Farm Machinery Field Capacities" (1991). Agricultural Engineering Extension Publications. 20.