Ke: Viability constant \mjseqnK_E based on the species-specific...
In aravind-j/viabilitymetrics: Seed Viability Calculations and Curve Fitting

Description Usage Arguments Details Value References See Also Examples

Ke computes the viability constant \mjseqnK_E from the species-specific temperature coefficients in case of storage experiments conducted at constant temperature and varying moisture contents. \loadmathjax

1	Ke(K, temp, temp.coeff = c(0.0329, 0.000478))

`K`	The constant \mjseqnK associated with the relationship of temperature with seed longevity (see Details).
`temp`	Temperature in °C.
`temp.coeff`	The species-specific temperature coefficients (\mjseqnC_H and \mjseqnC_Q) as a numeric vector of length 2.

From seed storage experiments involving storage of seeds at a constant temperature in a range of moisture contents, the effect of moisture content on seed longevity (\mjseqn\sigma) can be estimated from the following linear relationship:

\mjsdeqn\log\sigma

= K - C_w\logm

Where, \mjseqnK is the intercept, \mjseqnC_W is the slope and \mjseqnm is the moisture content.

The constant \mjseqnK associated with the relationship of temperature with seed longevity as follows.

\mjsdeqn

K = K_E - C_Ht - C_Qt^2

Where, \mjseqnK_E, \mjseqnC_H and \mjseqnC_Q are the species-specific seed viability constants.

The constant \mjseqnK_E can be estimated from the universal temperature constants (\mjseqnC_H = 0.0329 and \mjseqnC_Q = 0.000478) in case of seed storage experiments at constant temperature and varying moisture content as follows.

\mjsdeqn

K_E = K + C_Ht + C_Qt^2

The value of species-specific seed viability constant \mjseqnK_E.

\insertRef

ellis_improved_1980viabilitymetrics

\insertRef

pritchard_predicting_2003viabilitymetrics

Sigma