harvest index

noun Agriculture.
a measurement of crop yield: the weight of a harvested product as a percentage of the total plant weight of a crop.

Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Estimating grain and straw nitrogen concentration in grain crops based on aboveground nitrogen concentration and harvest index.
Biological yield, harvest index, and ear weight as indirect selection criteria for grain yield in wheat.
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