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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")
+#' }
+#' 
+NULL