K {asbio}

Soil potassium analyses from 8 laboratories

Description

Jacobsen et al. (2002) sent nine "identical" soil samples to eight soil testing laboratories in the Great Plains region of the Central United States over a three year period of time. Among other characteristics the labs were paid to measure soil potassium. A question of interest was whether the labs would produce identical analytical results.

Usage

data(K)

Format

A data frame with 72 observations on the following 2 variables.

K

Soil K in mg/kg

lab

Laboratories, a factor with levels B D E F G H I J

Source

Jacobsen, J. S., Lorber, S. H., Schaff, B. E., and C. A. Jones (2002) Variation in soil fertility test results from selected Northern Great Plains laboratories. Commun. Soil Sci. plant Anal., 33(3&4): 303-319.