Uniformity trials of soy hay and soybeans

Uniformity trials of soy hay and soybeans at Virginia Experiment Station, 1925-1926.

Format

Data frames with 3 variables.

row

row

col

column

yield

yield: hay in tons/acre, beans in bushels/acre

Details

Grown at West Virginia Experiment Station in 1925 & 1926.

Soy forage hay:

In 1925 the crop was harvested for forage, 42 rows, each 200 feet long. Yields of 8-foot plats recorded to the nearest 0.1 tons.

Field width: 42 plots * 30 in / 12in/ft = 105 ft

Field length: 24 plots * 8 feet = 192 feet + border = total 200 feet.

Note, the hay data in Odland & Garber is measured in 0.1 tons, but has been converted to tons here.

Soy beans:

Soybeans were planted in rows 30 inches apart. In 1926 the crop was harvested for seed, 55 rows, each 232 feet long. Yields of 8-foot plats were recorded. In 1926, data for the last row on page 96 seems to be missing.

Field width: 55 plots * 30 in / 12in/ft = 137.5 feet

Field length: 28 plots * 8 feet = 224 feet + border = total 232 feet.

Odland and Garber provide no agronomic context for the yield variation.

Source

Odland, T.E. and Garber, R.J. (1928). Size of Plat and Number of Replications in Field Experiments with Soybeans. Agronomy Journal, 20, 93–108. https://doi.org/10.2134/agronj1928.00021962002000020002x

Examples

if (FALSE) { # \dontrun{

library(agridat)
  
  libs(desplot)

  data(odland.soyhay.uniformity)
  dat1 <- odland.soyhay.uniformity
  desplot(dat1, yield ~ col*row,
          flip=TRUE, aspect=200/105, # true aspect
          main="odland.soyhay.uniformity")

  data(odland.soybean.uniformity)
  dat2 <- odland.soybean.uniformity
  desplot(dat2, yield ~ col*row,
          flip=TRUE, aspect = 232/137, 
          main="odland.soybean.uniformity")
  
} # }