drcSeedGerm (version 1.0.1)

excalibur: Relationship between germination rate and water potential in oilseed rape (var. Excalibur)

Description

This files describes the relationship between germination rate and water potential in the substrate for seeds of oilseed rape (var. Excalibur). Three germination percentiles are considered for germination rate, i.e. GR10, GR30 and GR50.

Usage

data("excalibur")

Format

A data frame with 27 observations on the following 5 variables.

Perc

a numeric vector: the germination percentile

Psi

a numeric vector: water potential in the substrate (in MPa)

Tg

a numeric vector: germination time in days

SE

a numeric vector: standard errors for germination times (in days)

GR

a numeric vector: germination rates in d^-1

References

Pace, R., Benincasa, P., Ghanem, M.E., Quinet, M., Lutts, S., 2012. Germination of untreated and primed seeds in rapeseed (Brassica napus var. oleifera Del.) under salinity and low matric potential. Experimental Agriculture 48, 238–251.

Examples

data(excalibur)
head(excalibur)
library(drc)

modGR1 <- drm(GR ~ Psi, fct=GRPsiLin(), data=excalibur, curveid=Perc)
summary(modGR1)
plot(modGR1, log="", legendPos=c(-0.9, 1))

modGR2 <- drm(GR ~ Psi, fct=GRPsiPol2(), data=excalibur, curveid=Perc)
summary(modGR2)
plot(modGR2, log="", legendPos=c(-0.9, 1))