Stream water concentrations of herbicides and nutrients for sites in the northern Missouri and southern Iowa region, 1994 to 1999

The data set contains stream water concentrations of herbicides and nutrients for 153 sites in the northern Missouri/southern Iowa region from 1994 to 1995. The data are available in Microsoft Excel 2010 format. Sheet 1 (Metadata) of the file contains supporting information regarding the length of record, site locations, parameters measured, concentrations units, method detection limits, describes the meaning of zero and blank cells, defines the major land resource areas (MLRAs) of the region, and provides a link to the U. S. Geological Survey discharge data. Sheet 2 (Site names and locations) has a list of the site names by MLRA, river system, and site name. It also contains site locations, provided as Universal Transverse Mercator coordinates, drainage areas, and indicates which sites were co-located at U. S. Geological Survey gauge sites. Sheet 3 (Concentration Data) contains data for 15 herbicide and nutrient analytes along with the corresponding site name, river system, and MLRA.

Atrazine concentrations in Goodwater Creek Experimental Watershed (GCEW) were shown to be among the very highest of any watershed in the United States based on comparisons using the national Watershed Regressions for Pesticides (WARP) model and by direct comparison with the 112 watersheds used in the development of WARP. The herbicide data collected in GCEW are documented at plot, field, and watershed scales. This 20-yr-long (1991-2010) effort was augmented with a spatially broad effort within the Central Mississippi River Basin encompassing 12 related claypan watersheds in the Salt River Basin, two cave streams on the fringe of the Central Claypan Areas in the Bonne Femme watershed, and 95 streams in northern Missouri and southern Iowa. The research effort on herbicide transport has highlighted the importance of restrictive soil layers with smectitic mineralogy to the risk of transport vulnerability. Near-surface soil features, such as claypans and argillic horizons, result in greater herbicide transport than soils with high saturated hydraulic conductivities and low smectitic clay content.

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Field	Value
Tags	Environment farming water quality contaminants percolation drainage basins Soils land use biodiversity crops plant yields nitrogen phosphorus water nutrients hydrology watersheds
Modified	2022-01-05
Release Date	2015-01-02
Identifier	GoodwaterNutrient_jjm_2015-03-12_1534
Spatial / Geographical Coverage Area	POLYGON ((-92.5 40.034, -91.71 40.034, -91.71 39.025, -92.5 39.025))
Publisher	Journal of Environmental Quality
Temporal Coverage	January 1, 1994 to January 1, 1999
License	Creative Commons Attribution
Contact Name	Lerch, Robert
Contact Email	bob.lerch@ars.usda.gov
Public Access Level	Public
Program Code	005:040 - Department of Agriculture - National Research
Bureau Code	005:18 - Agricultural Research Service
Source ID	GoodwaterNutrient_jjm_2015-03-12_1534

Harvested from Geodata Harvest
Harvest Source Title	Geodata Harvest
Harvest Source URI	https://geodata.nal.usda.gov/geonetwork/srv/eng/csw
Last Harvest Performed	Thu, 04/22/2021 - 01:01

Extended Metadata:

Field	Value
Authors	Lerch, Robert
Peer Reviewed	No
Intended Use	Nitrogen (N) and phosphorus (P) pollution of water resources has been a major environmental problem for decades, resulting in contaminated water supplies, detrimental effects on aquatic and human health, impaired recreational water quality, and formation of the hypoxic zone in the Gulf of Mexico. At field and plot scales, studies were designed to assess the impact of specific crop management practices, the overall effect of cropping systems, and the variation in soil properties at the landscape scale on N and P transport in surface runoff and to the shallow loess and glacial till aquifers of claypan soils. A key finding of these studies was that field areas with the poorest crop growth were also the most vulnerable to nutrient as well as sediment and herbicide transport. The datasets generated in the 20-yr-long (1991-2010) research effort are documented to study the transport of herbicides to surface and groundwater in the GCEW. A key finding was that near-surface restrictive soil layers, such as argillic horizons of smectitic mineralogy, result in greater herbicide transport than soils with high percolation and low clay content. Because of this, streams in the claypan soil watersheds of northeastern Missouri have exceptionally high herbicide concentrations and relative loads compared with other areas of the Corn Belt.
Use Limitations	Quality assurance (QA) samples were incorporated as part of all field studies and included duplicate, spike, and blank samples. If acceptable duplicate precision was not obtained after several tries, data from the most precise pair were reported and flagged. In many cases, samples were reanalyzed and the QA criteria were met. If the results were unacceptable after reanalysis, the data were not included in the Sustaining the Earth's Watersheds: Agricultural Research Data System (STEWARDS) database.
Funding Sources	Agricultural Research Service
Product Type	Dataset
Related Content	Web link to data

Field	Value
ISO Topic(s)	environment farming
State or Territory	Iowa Missouri
National Agricultural Library Thesaurus Term	streams herbicides nutrients rivers drainage atrazine watersheds models Mississippi River mineralogy argillic horizons clay fraction nitrogen phosphorus water pollution water supply human health water quality cropping systems soil properties landscapes runoff loess aquifers claypan soils sediments groundwater Corn Belt region
Ag Data Commons Keywords	Agroecosystems & Environment Agroecosystems & Environment Soil Nutrients Agroecosystems & Environment Soil Agroecosystems & Environment Water
Program	Central Mississippi River Basin Long-Term Agroecosystem Research - LTAR

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