MeanGermTime
computes the mean germination time according to the
following formula
edmond_effects_1958,czabator_germination_1962,smith_germinating_1964,ellis_improved_1980,labouriau_germinacao_1983,ranal_how_2006germinationmetrics.
T = _i=1^kN_iT_i_i=1^kN_i
Where, T_i is the time from the start of the experiment to the
ith interval, N_i is the number of seeds germinated in
the ith time interval (not the accumulated number, but the number
corresponding to the ith interval), and k is the total
number of time intervals.
It is the same as Sprouting Index (SI) or Emergence Index
(EI) described by
smith_germinating_1964;textualgerminationmetrics and
mock_cold_1972;textualgerminationmetrics as well as
Germination Resistance (GR) described by
gordon_observations_1969,gordon_germination_1971;textualgerminationmetrics.
It is the inverse of mean germination rate (V).
T = 1V
It indicates the average length of time required for maximum germination of a
seed lot. Lower the T, faster the sample has germinated
and reflects seed vigor.
VarGermTime
computes the variance of germination time according to the
following formula
labouriau_germinacao_1983,ranal_how_2006germinationmetrics.
s_T^2 =
_i=1^kN_i(T_i-T)^2_i=1^kN_i-1
Where, T_i is the time from the start of the experiment to the
ith interval, N_i is the number of seeds germinated in
the ith time interval (not the accumulated number, but the number
corresponding to the ith interval), and k is the total
number of time intervals.
SEGermTime
computes the standard error of germination time
(s_T) according to the following formula
labouriau_germinacao_1983,ranal_how_2006germinationmetrics.
s_T = s_T^2_i=1^kN_i
Where, N_i is the number of seeds germinated in the ith
time interval (not the accumulated number, but the number corresponding to
the ith interval), and k is the total number of time
intervals.
It signifies the accuracy of the calculation of the mean germination time.
CVGermTime
computes the coefficient of variation of germination time
(CV_T) according to the following formula
gomes_curso_1960,ranal_how_2006germinationmetrics.
CV_T = s_T^2T
This indicates the uniformity of germination and permits comparisons
irrespective of the magnitude of mean germination time
(T).