#' Yields of Canola
#'
#' The Canola dataset contains data from an experiment to
#' study the effects of nitrogen and sulphur on the yield
#' of canola, using a randomzed-block design.
#'
#' @format
#' \describe{A data frame with 36 observations on the
#' following five variables:
#' \item{blcok}{a factor specifying the blocks in the experiment.}
#' \item{plot}{a factor numbering the plots within each block.}
#' \item{N}{a factor specifying the amount of nitrogen
#' applied to each plot.}
#' \item{S}{a factor specifying the amount of sulphur
#' applied to each plot.}
#' \item{yield}{a numerical vector recording the
#' yield from each plot.}
#' }
#' @source
#' VSN International (2014). Genstat for Windows 17th Edition. VSN International,
#' Hemel Hempstead, UK. Web page: Genstat.co.uk.
#'
#' \url{www.vsni.co.uk/}
#'
field.map <- function(){
field.map <- agridat::desplot()
}
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