GSI {SeedCalc}

Germination Speed Index

Description

Calculates the Germination Speed Index (Maguire, 1982).

Usage

GSI(time,nger)

Arguments

time

A vector object containing the time for germination.

nger

A vector object containing the accumulated number of seeds germinated at each time.

References

MAGUIRE, J. D. Speed of germination-aid selection and evaluation for seedling emergence and vigor. Crop Science, v. 2, p. 176–177, 1962.

Examples

time <- c(1,2,3,4,5,6,7,8,9,10)
nger <- c(0,2,4,15,25,38,45,50,50,50)
GSI(time,nger)