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#' Deposition from spray drift expressed as percent of the applied dose as
#' published by the JKI
#'
#' Deposition from spray drift expressed as percent of the applied dose as
#' published by the German Julius-Kühn Institute (JKI).
#'
#' The data were extracted from the spreadsheet cited below using the R code
#' given in the example section. The spreadsheet is not included in the package
#' as its licence is not clear.
#'
#'
#' @name drift_data_JKI
#' @docType data
#' @format A list currently containing matrices with spray drift percentage
#' data for field crops (Ackerbau), and Pome/stone fruit, early and late
#' (Obstbau früh, spät).
#' @source JKI (2010) Spreadsheet 'Tabelle der Abdrifteckwerte.xls', retrieved
#' from
#' http://www.jki.bund.de/no_cache/de/startseite/institute/anwendungstechnik/abdrift-eckwerte.html
#' on 2015-06-11
#' @keywords datasets
#' @examples
#'
#' \dontrun{
#' # This is the code that was used to extract the data
#' library(readxl)
#' abdrift_path <- "../inst/extdata/Tabelle der Abdrifteckwerte.xls"
#' JKI_crops <- c("Ackerbau", "Obstbau früh", "Obstbau spät")
#' names(JKI_crops) <- c("Field crops", "Pome/stone fruit, early", "Pome/stone fruit, late")
#' drift_data_JKI <- list()
#'
#' for (n in 1:8) {
#' drift_data_raw <- read_excel(abdrift_path, sheet = n + 1, skip = 2)
#' drift_data <- as.matrix(drift_data_raw[1:9, 2:4])
#' dimnames(drift_data) <- list(distance = as.integer(drift_data_raw[1:9, 1]),
#' crop = JKI_crops)
#' drift_data_JKI[[n]] <- drift_data
#' }
#' save(drift_data_JKI, file = "../data/drift_data_JKI.RData")
#' }
#'
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