Pfr_P_ratio: Calculation of Pfr:Ptot ratio from spectral irradiance

Description Usage Arguments Value References

Description

Ratio between Pr and Ptot (photoequilibrium) for Type I Phytochrome.

Usage

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Pfr_P_ratio(w.length, s.irrad = rep(1, length(w.length)),
  unit.in = "energy", check.spectrum = TRUE, use.cached.mult = FALSE)

Arguments

w.length

numeric array of wavelength (nm)

s.irrad

numeric array of spectral (energy) irradiances (W m-2 nm-1) or (mol s-1 m-2)

unit.in

character string with allowed values "energy", and "photon", or its alias "quantum"

check.spectrum

logical indicating whether to sanity check input data, default is TRUE

use.cached.mult

logical indicating whether multiplier values should be cached between calls

Value

a single numeric value giving the unitless photon ratio

References

Mancinelli, A.L. (1994) The physiology of phytochrome action. In Photomorphogenesis in plants, 2nd edition. R.E. Kendrick and G.H.M. Kronenberg, eds. Kluwer Academic Publishers, Dordrecht, pp. 211-269. ISBN 978-0-7923-2551-2 (print), 978-94-011-1884-2 (on-line). DOI 10.1007/978-94-011-1884-2_10


photobiologyPlants documentation built on June 15, 2019, 1:03 a.m.