odland.soybean.uniformity {agridat} | R Documentation |
Uniformity trials of soy hay and soybeans
Description
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, beans in bushels
Details
Grown at West Virginia Experiment Station in 1925 & 1926.
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.
Soy hay:
In 1925 the crop was harvested for forage, 42 rows, each 200 feet long. Yields of 8-foot plats recorded.
Field width: 42 plots * 30 in / 12in/ft = 105 ft
Field length: 24 plots * 8 feet = 192 feet + border = total 200 feet.
Source
Odland, TE and Garber, RJ. 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
## Not run:
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")
## End(Not run)