Package: usfertilizer
Type: Package
Title: County-Level Estimates of Fertilizer Application in USA
Version: 0.1.5
Authors@R: c(
    person("Wenlong", "Liu", role = c("aut","cre"),
        email = 'wliu14@ncsu.edu')
    )
Maintainer: Wenlong Liu <wliu14@ncsu.edu>
Description: Compiled and cleaned the county-level estimates of fertilizer, 
    nitrogen and phosphorus, from 1945 to 2012 in United States of America (USA).  The commercial fertilizer data were originally 
    generated by USGS based on the sales data of commercial fertilizer. The manure data were estimated
    based on county-level population data of livestock, poultry, and other animals.
    See the user manual for detailed data sources and cleaning methods.  
    'usfertilizer' utilized the tidyverse to clean the original data and provide 
    user-friendly dataframe. Please note that USGS does not endorse this package. Also data from 1986 is not available for now.
License: GPL
URL: https://github.com/wenlong-liu/usfertilizer
BugReports: https://github.com/wenlong-liu/usfertilizer/issues
Depends: R (>= 2.10)
Imports: tidyverse
Suggests: knitr, rmarkdown
Encoding: UTF-8
LazyData: false
RoxygenNote: 6.0.1
VignetteBuilder: knitr
NeedsCompilation: no
Packaged: 2018-04-02 15:26:26 UTC; yingxigeng
Author: Wenlong Liu [aut, cre]
Repository: CRAN
Date/Publication: 2018-04-02 17:49:16 UTC
Built: R 4.4.3; ; 2026-02-25 05:51:59 UTC; windows
