Uniformity trial of beans in El Salvador

Uniformity trial of beans in El Salvador.

Usage

data("aguileracarreras.bean.uniformity")

Format

A data frame with 240 observations on the following 3 variables.

row

row ordinate

col

column ordinate

yield

yield per plot, in grams

Details

The experiment was grown near Santa Ana, El Salvador, in 1964.

The experimental plot was divided into 256 plots of 5 x 5 m each. In each of the 256 plots, soil samples were taken — consisting of six borings from 0 to 30 cm in depth — for the determination of phosphorus and potassium levels. In June 1964 the plots were planted to coffee, then in August 1964 a crop of beans was planted in double rows between the coffee trees.

Although the primary objective of the experiment related to coffee, a uniformity study was conducted with bean Phaseolus vulgaris of the variety Porrillo No 1. The reason for using bean was the need to use a crop that could be harvested in a relatively short period of time.

Field width: 16 columns x 5 m = 80 m

Field length: 16 rows x 5 m = 80 m

Data provenance: OCR performed by Claude. Hand-corrected by K.Wright.

Source

Aguilera Carreras, José Rutilio (1969). Heterogeneidad de un suelo latosol pardo forestal en un lote experimental de fertilización en café. Thesis, University of El Salvador. https://hdl.handle.net/20.500.14492/29100

References

None

Examples

if (FALSE) { # \dontrun{
library(agridat)
data(aguileracarreras.bean.uniformity)
dat <- aguileracarreras.bean.uniformity

mean(dat$yield)

libs(desplot)
desplot(dat, yield ~ col*row,
        flip=TRUE, tick=TRUE, aspect=(16*5)/(16*5),
        main="aguileracarreras.bean.uniformity")

} # }