Uniformity trial of strawberry
Uniformity trial of strawberry in Brazil.
data("nagai.strawberry.uniformity")A data frame with 432 observations on the following 3 variables.
rowrow
colcolumn
yieldyield grams/plot
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.
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
None
## Not run:
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")
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