Introduction and motivation Nutrient input to agricultural watersheds is a very popular topic among researchers, engineers and stakeholders. Researchers in United State Geographic Services (USGS) spent a considerable amount of time and efforts to generate fertilizr estimation dataset from synthetic fertilizer and manure. Based on the dataset published by USGS, the author developed an R package, ggfertilizer, to retrieve, summarize and visualize fertilizer data in contiguous U.S.A.
In this post, the author is going to briefly introduce the basics of ggfertilizer and provide a smooth and clear workflow to generate a reproducible fertilizer usage map.