Potency of two herbicides

Data are from an experiment, comparing the potency of the two herbicides glyphosate and bentazone in white mustard Sinapis alba.

data(S.alba.comp)

Format

A data frame with 141 observations on the following 8 variables.

exp

a factor with levels ben1, ben2, gly1, gly2 indicating which experiment each observation belongs to.

herbicide

a factor with levels Bentazone Glyphosate (the two herbicides applied).

dose

a numeric vector containing the dose in g/ha.

drymatter

a numeric vector containing the response (dry matter in g/pot).

Tf

a numeric vector .

area

a numeric vector .

Fo

a numeric vector .

Fm

a numeric vector .

Details

The lower and upper limits for the two herbicides can be assumed identical, whereas slopes and ED50 values are different (in the log-logistic model).

Source

Christensen, M. G. and Teicher, H. B., and Streibig, J. C. (2003) Linking fluorescence induction curve and biomass in herbicide screening, Pest Management Science, 59, 1303--1310.