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A review of literature was conducted to summarize the research and development of systems designed to collect mass-flow and yield data of hay and forage in windrowers, forage harvesters, and balers. The methods of determining mass flow include measuring feedroll displacement in forage harvesters, using impact plates in windrowers and forage harvesters, torque meters, load cells, and others. The yield maps developed from the systems are capable of showing spatial differences in crop yield. With little further evaluation hay and forage mass-flow systems could become a precision agricultural tool.