County-Level Estimates of Nitrogen and Phosphorus from Commercial Fertilizer for the Conterminous United States, 1987-2012

This data set contains county-level estimates of nitrogen and phosphorus from fertilizer, for both farm and nonfarm uses, for the conterminous United States, for 1987...本数据集包含1987年美国本土（conterminous United States）范围内，农业与非农业用途下化肥相关氮、磷的县级尺度估算值。