Uniformity trials of sugarcane, 4 fields

Usage

data("kerr.sugarcane.uniformity")

Format

A data frame with 564 observations on the following 4 variables.

row: row
col: column
yield: yield, pounds per plot
trial: trial number

Details

Experiment conducted at the Sugar Experiment Station, Brisbane, Queensland, Australia in 1937.

Four trials were harvested, each 12 plots by 12 plots, each plot 19 feet by 19 feet (one of the fields used 18-foot plots).

Trial 1 is plant cane.

Trial 2 is ratoon cane.

Trial 3 plant cane, irrigated.

Trial 4 is ratoon cane, irrigated.

Field length: 12 plots * 19 feet = 228 feet.

Field width: 12 plots * 19 feet = 228 feet.

Source

H. W. Kerr (1939). Notes on plot technique. Proc. Internat. Soc. Sugarcane Technol. 6, 764–778.

References

None

Examples

if (FALSE) { # \dontrun{

library(agridat)
data(kerr.sugarcane.uniformity)
dat <- kerr.sugarcane.uniformity

# match Kerr figure 4
libs(desplot)
desplot(dat, yield ~ col*row|trial,
        flip=TRUE, aspect=1, # true aspect
        main="kerr.sugarcane.uniformity")

# CV matches Kerr table 2, page 768
# aggregate(yield ~ trial, dat, FUN= function(x) round(100*sd(x)/mean(x),2))
##   trial yield
## 1    T1  7.95
## 2    T2  9.30
## 3    T3 10.37
## 4    T4 13.76

} # }