Actually, crop yield as a whole is not something that can be measured! Crop yield is a measurement that is derived, or calculated, from a combination of other measurements, like force, displacement or volume, speed of material flow, crop moisture content, harvester travel speed, and working width. Crop yield (also known as "agricultural output") is not only a measure of the yield of cereal per unit area of land under cultivation, but can also refer to the seed generation of the plant itself (i.e., one grain of wheat produces a stalk yielding three grain, or 1:3).
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