agridat (version 1.27)

lechadolopez.sorghum.uniformity: Uniformity trial of sorghum in Nicaragua

Description

Uniformity trial of sorghum in Nicaragua 1988.

Usage

data("lechadolopez.sorghum.uniformity")

Format

A data frame with 512 observations on the following 3 variables.

row

row ordinate

col

column ordinate

yield

yield per plot, kg/ha

Details

Experiment conducted 20 Aug - 23 Dec 1988. Near Managua, Nicaragua. 32 rows of 48 meters length, divided into 3 m plots. Rows separated by 0.75 m. Basic units 2.25 m^2

Field width: 16 columns * 3 m = 48 m

Field length: 32 rows * 0.75 m = 12 m

Data provenance: Typed by K.Wright from Lechado López (1989), page 14. Original data were given with 7 digits. We rounded to 0 decimals. One high outlier and two low outliers were checked with the original source, both on page 14 and on page 15 (which gave the sum of two plots in a row).

References

None

Examples

  library(agridat)
  data(lechadolopez.sorghum.uniformity)
  dat <- lechadolopez.sorghum.uniformity

  mean(dat$yield) # 5382 lechado p 14, 4384 here (because we rounded to 0 dec).

  libs(desplot)
  desplot(dat, yield ~ col*row,
          flip=TRUE, tick=TRUE, aspect=(32*.75)/(16*3), # true aspect
          main="lechadolopez.sorghum.uniformity")