Estimated Annual Agricultural Pesticide Use
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下载链接：
http://water.usgs.gov/nawqa/pnsp/usage/maps/index.php
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资源简介：
Annual county level pesticide use is estimated for selected herbicides, insecticides, and fungicides applied to agricultural crops grown in the conterminous United States from 1992 through present. Downloadable tabular data files are provided for each year in which estimates were made. In addition maps and charts of pesticide use are provided to show the geographic distribution of estimated use. It is anticipated that as data become available for each consecutive year new estimates, in the form of tabular data as well as maps and charts, will be added to the site. Methods on how estimates are made is included on the site. All tabular data available on the site have been approved for release
提供机构：
U.S. Geological Survey
创建时间：
2016-09-01
