mercer.mangold.uniformity {agridat} | R Documentation

## Uniformity trial of mangolds

### Description

Uniformity trial of mangolds at Rothamsted Experiment Station, England, 1910.

### Usage

    data("mercer.mangold.uniformity")

### Format

A data frame with 200 observations on the following 4 variables.

`row`

  row

`col`

  column

`roots`

  root yields, pounds

`leaves`

  leaf yields, pounds

### Details

Grown in 1910.

Each plot was 3 drills, each drill being 2.4 feet wide. Plots were 1/200 acres, 7.2 feet by 30.25 feet long The "length of the plots runs with the horizontal lines of figures [in Table I], this being also the direction of the drills across the field."

Field width: 10 plots * 30.25ft = 302.5 feet

Field length: 20 plots * 7.25 ft = 145 feet

### Source

Mercer, WB and Hall, AD, 1911. The experimental error of field trials The Journal of Agricultural Science, 4, 107-132. Table 1. http://doi.org/10.1017/S002185960000160X

### References

McCullagh, P. and Clifford, D., (2006). Evidence for conformal invariance of crop yields, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 462, 2119–2143. http://doi.org/10.1098/rspa.2006.1667

### Examples

    ## Not run:

      data(mercer.mangold.uniformity)
      dat <- mercer.mangold.uniformity

      require(desplot)
      desplot(leaves~col*row, data=dat,
              aspect=145/302, # true aspect
              main="mercer.mangold.uniformity - leaves")

      require(desplot)
      desplot(roots~col*row, data=dat,
              aspect=145/302, # true aspect
              main="mercer.mangold.uniformity - roots")

      require(lattice)
      xyplot(roots~leaves, data=dat)

    ## End(Not run)

[Package agridat version 1.16 Index]