County-based estimates of nitrogen and phosphorus content of animal manure in the United States for 1982, 1987, and 1992.

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This data set contains county estimates of nitrogen and phosphorus content of animal wastes produced annually for the years 1982, 1987, and 1992. The estimates are based on animal populations for those years from the 1992 Census of Agriculture (U.S. Bureau of the Census, 1995) and methods for estimating the nutrient content of manure from the Soil Conservation Service (1992). The data set includes several components.. 1. Spatial component - generalized [...]

本数据集发布于2016年10月1日之前，符合美国地质调查局（USGS）制定的科学数据审查、批准与发布政策，该政策详见美国地质调查局《调查手册》第502.8章：基础科学实践：科学数据发布的审查与批准。本数据集包含1982年、1987年及1992年年度畜禽粪便氮、磷含量的县级估算值。该估算值基于1992年农业普查（美国人口普查局，1995）中对应年份的畜禽存栏量，以及美国土壤保持局（Soil Conservation Service，1992）提出的畜禽粪便养分含量估算方法。本数据集包含多个组成部分：1. 空间组分（Spatial component）—— 经概化处理[...]