Uniformity trial with sugarcane

Usage

data("igue.sugarcane.uniformity")

Format

A data frame with 1512 observations on the following 3 variables.

row

row

col

column

yield

yield, kg/plot

Details

A uniformity trial with sugarcane in the state of Sao Paulo, Brazil, in 1982. The field was 40 rows, each 90 m long, with 1.5 m between rows.

Field width: 36 plots * 1.5 m = 54 m

Field length: 42 plots * 2 m = 84 m

Source

Toshio Igue, Ademar Espironelo, Heitor Cantarella, Erseni Joao Nelli. (1991). Tamanho e forma de parcela experimental para cana-de-acucar (Plot size and shape for sugar cane experiments). Bragantia, 50, 163-180. Appendix, page 169-170. https://dx.doi.org/10.1590/S0006-87051991000100016

References

None

Examples

if (FALSE) {

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

# match Igue CV top row of page 171
sd(dat$yield)/mean(dat$yield) # 16.4

libs(desplot)
desplot(dat, yield ~ col*row,
        flip=TRUE, tick=TRUE, aspect=(42*2)/(36*1.5),
        main="igue.sugarcane.uniformity")
  
}