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 NEWS.md 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.