lyon.potato.uniformity.Rd
Uniformity trial of potatoes at Nebraska Experiment Station, 1909.
A data frame with 204 observations on the following 3 variables.
row
row
col
column, section
yield
yield, pounds
In 1909, potatoes were harvested from uniform land at Nebraska Experiment Station.
There were 34 rows, 34 inches apart. Lyon, page 97 says "He harvested each row in six sections, each of which was seventy-two feet and seven inches long." It is not clear if each section is 72 feet long, or if the entire row is 72 feet long. Yield of potato is roughly 0.5 to 0.8 pounds per square foot, so it seems more plausible the entire row is 72 feet long (see calculations below).
Field width: 6 plots = 72 feet
Field length: 34 rows * 34 in / 12in/ft = 96 ft
Lyon, T.L. (1911). Some experiments to estimate errors in field plat tests. Proc. Amer. Soc. Agron, 3, 89-114. Table III. https://doi.org/10.2134/agronj1911.00021962000300010016x
None.
# \dontrun{ library(agridat) data(lyon.potato.uniformity) dat <- lyon.potato.uniformity # Yield per square foot, assuming 72 foot rows sum(dat$yield)/(72*96) # 0.67 # seems about right#> [1] 0.6738571#> [1] 0.1123095libs(desplot) desplot(dat, yield ~ col*row, tick=TRUE, flip=TRUE, aspect=96/72, # true aspect main="lyon.potato.uniformity")# }