County-Level Estimates of Fertilizer Application in USA

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.


usfertilizer 0.1.0

  • Decided to change the type of package into a pure data package.
  • Removed irrelevant codes.

usfertilizer 0.1.1

  • Update the description to pass the CRAN comments.

usfertilizer 0.1.2

  • Passed CRAN checks and available at CRAN.

usfertilizer 0.1.3

  • Added a file to track changes to the package.
  • Added the data sources and processes codes.
  • Added a license file and code of conduct.
  • Enable website for project using pkgdown.

usfertilizer 0.1.4

  • Added manure data from 1982 to 2012 (every five years).
  • Update the column names: Fertilizer -> Nutrient.
  • Added another column: Input.Type to indicate the nutrient input type.
  • Update readme and related articles.
  • Fixed the failed build of vignettes.

usfertilizer 0.1.5

  • Specify that the dataset were about United States of America (USA).
  • Update the titles of vignette.
  • Removed the documention about installing the package via Github.

Reference manual

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0.1.5 by Wenlong Liu, 3 years ago

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Browse source code at

Authors: Wenlong Liu [aut, cre]

Documentation:   PDF Manual  

GPL license

Imports tidyverse

Suggests knitr, rmarkdown

See at CRAN