National Water-Quality Assessment (NAWQA) Project
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Estimation Methods:
Beginning 2015, the provider of the surveyed pesticide data used to derive the county-level use estimates discontinued making estimates for seed treatment application of pesticides because of complexity and uncertainty. Pesticide use estimates prior to 2015 include estimates with seed treatment application.
U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: gs-w_nawqa_whq@usgs.gov
Page Last Modified: October 12 2021 15:41:19.
