Uniformity trial of wheat

Usage

data("baker.wheat.uniformity")

Format

A data frame with 225 observations on the following 3 variables.

row: row
col: col
yield: yield (grams)

Details

Data was collected in 1939-1940. The trial consists of sixteen 40 ft. x 40 ft. blocks subdivided into nine plots each. The data were secured in 1939-1940 from White Federation wheat. The design of the experiment was square with alleys 20 feet wide between blocks. The plots were 10 feet long with two guard rows on each side.

Morning glories infested the middle two columns of blocks, uniformly over the blocks affected.

The data here include missing values for the alleys so that the field map is approximately the correct shape and size.

Field width: 4 blocks of 40 feet + 3 alleys of 20 feet = 220 feet.

Field length: 4 blocks of 40 feet + 3 alleys of 20 feet = 220 feet.

Source

G. A. Baker, E. B. Roessler (1957). Implications of a uniformity trial with small plots of wheat. Hilgardia, 27, 183-188. https://hilgardia.ucanr.edu/Abstract/?a=hilg.v27n05p183 https://doi.org/10.3733/hilg.v27n05p183

References

None

Examples

if (FALSE) { # \dontrun{
  
  library(agridat)
  data(baker.wheat.uniformity)
  dat <- baker.wheat.uniformity

  libs(desplot)
  desplot(dat, yield ~ col*row,
          flip=TRUE, aspect=1,
          main="baker.wheat.uniformity")

} # }