Description Usage Arguments Details Value References See Also Examples

Compute the Germination index according to \insertCitemelvilleSeedGerminationEarly1980;textualgerminationmetrics and its modification by \insertCitede_santana_alise_2004;textualgerminationmetrics \insertCiteranal_how_2006germinationmetrics. \loadmathjax

1 2 3 4 5 6 7 |

`germ.counts` |
Germination counts at each time interval. Can be partial
or cumulative as specified in the argument |

`intervals` |
The time intervals. |

`partial` |
logical. If |

`total.seeds` |
Total number of seeds. |

`modification` |
The modification to be applied. Either |

Germination index (\mjseqnGI) is computed as follows \insertCitemelvilleSeedGerminationEarly1980germinationmetrics.

\mjsdeqnGI = \sum_i=1^k\frac\left | \left ( T_k - T_i \right ) N_i\right |N_t

Where, \mjseqnT_i is the time from the start of the experiment to the \mjseqnith interval (day for the example), \mjseqnN_i is the number of seeds germinated in the \mjseqnith time interval (not the accumulated number, but the number corresponding to the \mjseqnith interval), \mjseqnN_t is the total number of seeds used in the test, and \mjseqnk is the total number of time intervals.

A modified germination index (\mjseqnGI_mod) was proposed by \insertCitede_santana_alise_2004germinationmetrics where total number of seeds tested (\mjseqnNt) is replaced by the total number of germinated seeds (\mjseqnNg) in the expression of \insertCitemelvilleSeedGerminationEarly1980;textualgerminationmetrics to remove the effect of sample size \insertCiteranal_how_2006germinationmetrics.

\mjsdeqnGI_mod = \sum_i=1^k\frac\left | \left ( T_k - T_i \right ) N_i\right |N_g

The term Germination index (\mjseqnGI) has also been used to describe the
mathematical expression for Speed of germination
(`GermSpeed`

) by
\insertCiteaosa_seed_1983;textualgerminationmetrics.

The value of the Germination index.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
x <- c(0, 0, 0, 0, 4, 17, 10, 7, 1, 0, 1, 0, 0, 0)
y <- c(0, 0, 0, 0, 4, 21, 31, 38, 39, 39, 40, 40, 40, 40)
int <- 1:length(x)
# From partial germination counts
#----------------------------------------------------------------------------
GermIndex(germ.counts = x, intervals = int, total.seeds = 50)
GermIndex(germ.counts = x, intervals = int, total.seeds = 50,
modification = "none")
GermIndex(germ.counts = x, intervals = int, total.seeds = 50,
modification = "santanaranal")
# From cumulative germination counts
#----------------------------------------------------------------------------
GermIndex(germ.counts = y, intervals = int, partial = FALSE,
total.seeds = 50)
GermIndex(germ.counts = y, intervals = int, partial = FALSE,
total.seeds = 50,
modification = "none")
GermIndex(germ.counts = y, intervals = int, partial = FALSE,
total.seeds = 50,
modification = "santanaranal")
``` |

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