forestmangr: Forest Mensuration and Management

#' @title 
#' Experimental data on nitrogen effect in species fertilizing
#' @description 
#' In this data, each observation is a tree.
#' @usage 
#' data(exfm13)
#' 
#' @format
#' A data frame with 36 observations and 7 variables:
#' \describe{
#'   \item{species}{species common name}
#'   \item{trat}{treatment number}
#'   \item{esp}{species number}
#'   \item{N}{quantity of nitrogen used, in grams}
#'   \item{N2}{squared quantity of nitrogen used, in squared grams}
#'   \item{block}{block number}
  #'   \item{dbh}{diameter at breast height, in centimeters}
#' }
#' @name exfm13
#' @docType data
#' @author Sollano Rabelo Braga \email{sollanorb@@gmail.com}
#' @keywords data
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