Use Harvest Index when you need to compute the harvest index as grain yield divided by total above-ground biomass, which must not exceed the biomass. Enter Grain yield and Total biomass using the definitions and units below so the result can be reproduced.

Grain yield

A finite measured or assumed value greater than or equal to 0, expressed in kg.

Total biomass

A finite measured or assumed value, expressed in kg.

The published tool contract uses this rule: Compute the harvest index as grain yield divided by total above-ground biomass, which must not exceed the biomass.

Harvest index

The calculated harvest index.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small.

Retain the original Grain yield and Total biomass values and their units alongside the result. Drought Tolerance Index is useful when you instead need to compute the drought tolerance index as stressed yield divided by control yield times one hundred. LAI Calculator provides another view by helping you compute the leaf area index as total one-sided leaf area divided by the ground surface area it covers.

• Drought Tolerance Index

  Compute the drought tolerance index as stressed yield divided by control yield times one hundred.

• LAI Calculator

  Compute the leaf area index as total one-sided leaf area divided by the ground surface area it covers.

• Salt Tolerance Index

  Compute the salt tolerance index as stressed yield divided by control yield times one hundred.