Agriculture & Soil

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Harvest Index

Fraction of total plant mass that is harvestable grain.

Formula

HI = \frac{Y_{econ}}{Y_{bio}}

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Variables

HIHarvest index

Y_{econ}Economic (grain) yield

Y_{bio}Total biomass

Example

Grain 5 t, biomass 12 t: HI ≈ 0.42

Did You Know?

Breeding higher harvest index — more grain, less straw — was central to the Green Revolution's success.

agriculture harvest index yield

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