agridat (version 1.23)

kristensen.barley.uniformity: Uniformity trial of barley

Description

Uniformity trial of barley conducted in Denmark, 1905.

Usage

data("kristensen.barley.uniformity")

Format

A data frame with 718 observations on the following 3 variables.

row

row

col

column

yield

yield, hectograms/plot

Details

Experiment conducted in 1905 at Askov, Denmark. Harvested plot size was 10 x 14 'alen', 6.24 x 8.79 meters. The soil was uniform, but an attack of mildew spread from an adjacent field. Yield is measured in hectograms/plot for straw and grain together. (Page 468).

Orientation of the plots dimensions is not clear from the text, but the aspect used in the example below aligns well with Kristensen figure 1.

Field width: 22 plots * 8.79 m

Field length: 11 plots * 6.24 m

Notes from Kristensen: Fig 5 is a 3x3 moving average, Fig 6 is deviation from the trend, Fig 7 is the field average added to the deviation. Fig 13 is another uniformity trial of barley in 1924, Fig 14 is a uniformity trial of oats in 1924.

References

J. Neyman, K. Iwaszkiewicz, St. Kolodziejczyk. (1935). Statistical Problems in Agricultural Experimentation. Supplement to the Journal of the Royal Statistical Society, Vol. 2, No. 2 (1935), pp. 107-180. https://doi.org/10.2307/2983637

Examples

if (FALSE) {

library(agridat)
data(kristensen.barley.uniformity)
dat <- kristensen.barley.uniformity

libs(desplot)
desplot(dat, yield ~ col*row,
        flip=TRUE, aspect=(11*6.24)/(22*8.79),
        main="kristensen.barley.uniformity")
  
}