In modern agriculture we deal with two systems of units, the U.S. Customary system (sometimes called the English or gravimetric system) and the Metric or SI system. Both of these systems will be discussed in this chapter.
The bases for many of the units of measure in the customary system are lost in history. The Weights and Measures Division of the National Institute of Standards and Technology has the responsibility of storing and maintaining the standards for all of the customary units of measures. They have the standard foot, the standard yard, the standard pound, etc. All of the measuring devices used in the United States are based on one of these standards.
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