data_sources

This package uses two primary data sources:

datasets

A comprehensive framework for analyzing agricultural nutrient
balances across multiple spatial scales (county, 'HUC8', 'HUC2') with
integration of wastewater treatment plant ('WWTP') effluent loads for both
nitrogen and phosphorus. Supports classification of spatial units as
nutrient sources, sinks, or balanced areas based on agricultural surplus
and deficit calculations. Includes visualization tools, spatial transition
probability analysis, and nutrient flow network mapping. Built-in datasets
include agricultural nutrient balance data from the Nutrient Use Geographic
Information System ('NuGIS'; The Fertilizer Institute and Plant Nutrition
Canada, 1987-2016) <https://nugis.tfi.org/tabular_data/> and U.S. Environmental
Protection Agency ('EPA') wastewater discharge data from the 'ECHO' Discharge
Monitoring Report ('DMR') Loading Tool (2007-2016)
<https://echo.epa.gov/trends/loading-tool/water-pollution-search>. Data
are downloaded on demand from the Open Science Framework ('OSF') repository to
minimize package size while maintaining full functionality. The integrated
'manureshed' framework methodology is described in Akanbi et al. (2025)
<doi:10.1016/j.resconrec.2025.108697>. Designed for
nutrient management planning, environmental analysis, and circular
economy research at watershed/administrative to national scales.
This material is based upon financial support by the National Science Foundation,
EEC Division of Engineering Education and Centers,
NSF Engineering Research Center for Advancing Sustainable and Distributed
Fertilizer Production (CASFER), NSF 20-553 Gen-4 Engineering Research Centers
award 2133576. We thank Dr. Robert D. Sabo (U.S. Environmental Protection Agency)
for his valuable contributions to the conceptual development and review of this work.

Olatunde Akanbi

manureshed

Spatiotemporal Nutrient Balance Analysis Across Agricultural and
Municipal Systems

data_sources function

The Nutrient Use Geographic Information System (NuGIS) presents cropland
nutrient balances for the conterminous United States from 1987-2016.
Source: The Fertilizer Institute (TFI) and Plant Nutrition Canada (PNC)
Website: <a href="https://nugis.tfi.org/tabular_data">https://nugis.tfi.org/tabular_data</a>
Contact: nugis@tfi.org
Components:<ul>
<li>County-level crop and livestock data from USDA Census of Agriculture</li>
<li>Fertilizer use data from AAPFCO</li>
<li>Geospatial nutrient balance estimates</li>
<li>Available for counties, HUC8, and HUC2 watersheds</li>
</ul>Data Processing: The manureshed package uses cleaned versions of
NuGIS data with resolved metadata issues and enhanced spatial integration,
as detailed in the manureshed methodology paper (Akanbi et al., 2026).

NuGIS Agricultural Data

Source: U.S. Environmental Protection Agency
System: Discharge Monitoring Report (DMR) Loading Tool via ECHO
Website: <a href="https://echo.epa.gov/trends/loading-tool/water-pollution-search">https://echo.epa.gov/trends/loading-tool/water-pollution-search</a>
Data Years: 2007-2016 (nitrogen and phosphorus loads)
License: Public domain (U.S. Government work)

EPA WWTP Data

When using this package, please cite both the package, methodology paper, and the underlying
data sources. Use <code>citation_info()</code> to display full citation information.

Data Attribution

NuGIS and EPA WWTP Data Sources — data_sources

The Nutrient Use Geographic Information System (NuGIS) presents cropland
nutrient balances for the conterminous United States from 1987-2016.
Source: The Fertilizer Institute (TFI) and Plant Nutrition Canada (PNC)
Website: <a href='https://nugis.tfi.org/tabular_data'>https://nugis.tfi.org/tabular_data</a>
Contact: nugis@tfi.org
Components:<ul>
<li>County-level crop and livestock data from USDA Census of Agriculture</li>
<li>Fertilizer use data from AAPFCO</li>
<li>Geospatial nutrient balance estimates</li>
<li>Available for counties, HUC8, and HUC2 watersheds</li>
</ul>

Data Processing: The manureshed package uses cleaned versions of
NuGIS data with resolved metadata issues and enhanced spatial integration,
as detailed in the manureshed methodology paper (Akanbi et al., 2026).

Source: U.S. Environmental Protection Agency
System: Discharge Monitoring Report (DMR) Loading Tool via ECHO
Website: <a href='https://echo.epa.gov/trends/loading-tool/water-pollution-search'>https://echo.epa.gov/trends/loading-tool/water-pollution-search</a>
Data Years: 2007-2016 (nitrogen and phosphorus loads)
License: Public domain (U.S. Government work)

When using this package, please cite both the package, methodology paper, and the underlying
data sources. Use <code>citation_info()</code> to display full citation information.

data_sources: NuGIS and EPA WWTP Data Sources

Description

Arguments

NuGIS Agricultural Data

EPA WWTP Data

Data Attribution