agridat (version 1.25)

tulaikow.wheat.uniformity: Uniformity trial of winter/spring wheat

Description

Uniformity trial of winter/spring wheat in Russia

Usage

data("tulaikow.wheat.uniformity")

Format

A data frame with 480 observations on the following 4 variables.

row

row ordinate

col

column ordinate

yield

yield in grams per plot

season

winter or summer

Details

Land was fallow in 1911, harvested in 1912 at the Bezenchuk Experimental Station in Russia. A winter wheat field of 240 square sazhen (24 x 10 sazhen) was divided into separate plots of 1 square sazhen, which were cut, threshed and weighed separately.

In the same way, a plot of Poltavka spring wheat was harvested and a plot of 240 square sazhen with dimensions of 15 by 16 sazhen was divided into plots of 1 square sazhen.

Winter wheat:

Field length: 10 rows * 1 sazhen.

Field width: 24 columns * 1 sazhen.

Summer wheat:

Field length: 16 rows * 1 sazhen.

Field width: 15 columns * 1 sazhen.

Note: The Russian word (that looks like "cax" with a vertical line in the "x") refers to a unit of measurement. Specifically, it represents the sazhen, which was used in traditional Russian systems of measurement. The sazhen itself is approximately 3 meters (7 feet) long. Google Translate sometimes converts "sazhen" into "soot", "meter" or "fathom".

Transcription details: The data were typed by K.Wright from Roemer (1920), table 4, p. 63.

References

Neyman, J., & Iwaszkiewicz, K. (1935). Statistical problems in agricultural experimentation. Supplement to the Journal of the Royal Statistical Society, 2(2), 107-180.

Roemer, T. (1920). Der Feldversuch. Arbeiten der Deutschen Landwirtschafts-Gesellschaft, 302. https://www.google.com/books/edition/Arbeiten_der_Deutschen_Landwirtschafts_G/7zBSAQAAMAAJ

Examples

if (FALSE) {
  library(agridat)
  data(tulaikow.wheat.uniformity)
  dat <- tulaikow.wheat.uniformity
  
  libs(desplot)
  desplot(dat, yield~col*row, subset=season=="winter",
          aspect=10/24, flip=TRUE, tick=TRUE,
          main="tulaikow.wheat.uniformity (winter)")
  desplot(dat, yield~col*row, subset=season=="summer",
          aspect=16/15, flip=TRUE, tick=TRUE,
          main="tulaikow.wheat.uniformity (summer)")
}