Uniformity trial of tomato

Uniformity trial of tomato in Indiana

Usage

data("hartman.tomato.uniformity")

Format

A data frame with 384 observations on the following 3 variables.

row

row

col

column

yield

yield, pounds per plot

Details

Grown in Indiana in 1941.

The column ordinates in this R package dataset are not quite exactly the same as in the field due to the presence of roads.

Plants were spaced 3 feet apart in rows 6 feet apart, 330 feet long. Each row was divided into 3 sections of 34 plants sparated by strips 12 feet long to provide roadways for vehicles.

Each row was divided into 4-plant plots, with 8 plots in each section of row and with one plant left as a guard at the end of each section.

There were 49 plants missing out of 3072 total plants, but these have been ignored.

Note, the data given in Table 1 of Hartman are for 8-plant plots!

Field width: 3 sections (34 plants * 3 feet) + 2 roads * 12 feet = 330 feet.

Field length: 32 rows * 6 feet = 192 feet

As oriented on the page, plots were, on average, 330/12=27.5. feet wide, 6 feet tall.

Discussion notes from Hartman.

Total yield is 26001 pounds. Hartman says the yield of the field was 10.24 tons per acre, which we can verify:

26001 lb/field * (1/384 field/plot) * (1/(24*6) plot/ft2) * (43560 ft2/acre) * (1/2000 tons/lb) = 10.24 tons/acre

The rows on the top/bottom (north/south) were intended as guard rows, and had yields similar to the other rows, suggesting that competition between rows did not exist. For comparing varieties, 96*6 foot plots work well.

Source

J. D. Hartman and E. C. Stair (1942). Field Plot Technique With Tomatoes. Proceedings Of The American Society For Horticultural Science, 41, 315-320. https://archive.org/details/in.ernet.dli.2015.240678

References

None

Examples

if (FALSE) { # \dontrun{

library(agridat)
data(hartman.tomato.uniformity)
libs(desplot)
desplot(hartman.tomato.uniformity, yield ~ col*row, 
        flip=TRUE, tick=TRUE, aspect=192/330, # true aspect
        main="hartman.tomato.uniformity")

} # }