Use Seed Vigor Index when you need to compute the seed vigor index as germination percent times seedling length in centimeters divided by one hundred. Enter Germination percent and Seedling length using the definitions and units below so the result can be reproduced.

Germination percent

Germination percentage between 0 and 100.

Seedling length

Seedling length in centimeters; must be greater than zero.

The published tool contract uses this rule: Compute the seed vigor index as germination percent times seedling length in centimeters divided by one hundred.^[1]

Vigor index

Seed vigor index in percent-centimeters per hundred.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small. Germination percent must remain between 0 and 100.

Retain the original Germination percent and Seedling length values and their units alongside the result. Vigorous Seedling Index is useful when you instead need to compute the vigorous seedling index as seedling dry mass in milligrams times the germination percentage divided by one hundred. Seedling Vigor Index provides another view by helping you compute the documented seedling vigor index as germination percent times seedling length in centimeters.

• Vigorous Seedling Index

  Compute the vigorous seedling index as seedling dry mass in milligrams times the germination percentage divided by one hundred.

• Seedling Vigor Index

  Compute the documented seedling vigor index as germination percent times seedling length in centimeters.

• Drought Tolerance Index

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