agridat (version 1.25)

kalamkar.potato.uniformity: Uniformity trial of potatoes

Description

Uniformity trial of potatoes at Saskatchewan, Canada, 1929.

Usage

data("kalamkar.potato.uniformity")

Format

A data frame with 576 observations on the following 3 variables.

row

row

col

column

yield

yield, pounds per plot

Details

The data is for potato yields in 96 rows, each 132 feet long, with 3 feet between rows.

Each row was harvested as six plots, each 22 feet long. Each hill had one seed piece. Hills were spaced 2 feet apart in each row.

Field width: 6 plots * 22 feet = 132 feet

Field length: 96 rows * 3 feet = 288 feet

Units of yield are not given. In this experiment, there were 22 plants per plot. Today potato plants yield 3-5 pounds. If we assume this experiment had a yield of about 2 pound per plant, that would be 22 pounds per plot, which is similar to the data values. Also, Kirk 1929 mentions "200 bushels per acre", and 22 pounds per plot x (43560/66) divided by (60 pounds per bushel) = 242, so this seems reasonable. Also the `kirk.potato` data by the same author was recorded in pounds per plot.

References

Kirk, L. E. (1929) Field plot technique with potatoes with special reference to the Latin square. Scientific Agriculture, 9, 719. https://cdnsciencepub.com/doi/10.4141/sa-1929-0067 https://doi.org/10.4141/sa-1929-0067 https://www.google.com/books/edition/Revue_Agronomique_Canadien/-gMkAQAAMAAJ

Examples

if (FALSE) {

library(agridat)
data(kalamkar.potato.uniformity)
dat <- kalamkar.potato.uniformity

# Similar to figure 1 of Kalamkar
libs(desplot)
desplot(dat, yield~col*row,
        flip=TRUE, tick=TRUE, aspect=288/132, # true aspect
        main="kalamkar.potato.uniformity")
  
}