beckett.maize.uniformity: A uniformity trial of maize in Ghana.

In agridat: Agricultural Datasets

A uniformity trial of maize in Ghana.

Description

A uniformity trial of maize in Ghana.

Usage

data("beckett.maize.uniformity")

Format

A data frame with 83 observations on the following 8 variables.

plot

plot number

row

row ordinate

col

column ordinate

germination

germination count

earnum

number of ears per plot

earwt

ear weight per plot

yield

grain yield per plot, pounds

stalks

number of stalks per plot

Details

Experiment at the Asuansi Experiment Station (Ghana). Each plot is 1/40 acre, square in shape, 33 x 33 feet. Seed was sown in 23 March 1928, four seeds per hole. Holes were 3 feet by 3 feet, giving 121 stands/hills per plot. Germination data collected 3-4 April. Counts of stalks were made 23 May, but "reliance is not attached to these figures". Harvesting was done 16-17 August. Due to staff shortages, only 15 plots chosen at random were measured for ears and yield.

Field width: 6 plots * 33 feet = 198 feet

Field length: 19 plots * 33 feet = 627 feet

Transcription details: Data typed by hand and checked by K.Wright 2024.12.06.

Source

Beckett, W.H.; Fletcher, S.R.B. (1929). A uniformity trial with maize. Gold Coast Dept Agric Bull 16: 222-226. https://babel.hathitrust.org/cgi/pt?id=coo.31924066682166&seq=470

References

None

Examples

## Not run: 
  libs(agridat)
  data(beckett.maize.uniformity)
  dat <- beckett.maize.uniformity
  
  # QC. germination, earnum match published values.
  # stalks published value is 33091, but here 33101. (Data were hand-checked)
  colSums(dat)

  # Examine correlations. earwt,yield high cor
  pairs(dat[ , c("germination","stalks","earnum","earwt","yield")])

  libs(desplot)
  desplot(dat, germination ~ col*row,
          flip=TRUE, aspect=19/6,
          main="beckett.maize.uniformity - stalks")
  desplot(dat, yield ~ col*row,
          flip=TRUE, aspect=19/6,
          main="beckett.maize.uniformity - yield")

## End(Not run)

agridat documentation built on Nov. 5, 2025, 5:18 p.m.