Uniformity trial of strawberry

Usage

data("nagai.strawberry.uniformity")

Format

A data frame with 432 observations on the following 3 variables.

row

row

col

column

yield

yield, grams/plot

Details

A uniformity trial of strawberry, at Jundiai, Brazil, in April 1976.

The spacing between plants and rows was 0.3 m. Test area was 233.34 m^2. There were 18 rows of 144 plants. Each plat consisted of 6 consecutive plants. There were 432 plats, each 0.54 m^2.

Field length: 18 rows * 0.3 m = 5.4 m.

Field width: 24 columns * 6 plants * 0.3 m = 43.2 m.

Source

Violeta Nagai (1978). Tamanho da parcela e numero de repeticoes em experimentos com morangueiro (Plot size and number of repetitions in experiments with strawberry). Bragantia, 37, 71-81. Table 2, page 75. https://dx.doi.org/10.1590/S0006-87051978000100009

References

None

Examples

if (FALSE) {

library(agridat)
  
  data(nagai.strawberry.uniformity)
  dat <- nagai.strawberry.uniformity
  
  # CV matches Nagai
  # with(dat, sd(yield)/mean(yield))
  # 23.42
  
  libs(desplot)
  desplot(dat, yield ~ col*row,
          flip=TRUE, aspect=(5.4)/(43.2), # true aspect
          main="nagai.strawberry.uniformity")
}