{"@type": "dcat:Dataset", "accessLevel": "public", "accrualPeriodicity": "R/P1M", "bureauCode": ["005:18"], "contactPoint": {"fn": "Rogovska, Natalia (natalia.rogovska@usda.gov) and Ruis, Sabrina (sabrina.ruis@usda.gov)", "hasEmail": "mailto:natalia.rogovska@usda.gov"}, "description": "<p dir=\"ltr\">Organic production aims to diversify crop rotation and use organic fertilizer sources to build soil fertility and improve soil health indicators. This data evaluates the impact of organic farming on water quality in artificially drained midwestern Mollisols of central Iowa. This 7-year study compares tile nitrate loss and yields under three cropping systems: (1) conventional corn (<i>Zea mays</i> L)-soybean (<i>Glycine max</i> L.), (2) organic corn\u2013soybean\u2013oat (<i>Avena sativa</i> L.)/alfalfa (<i>Medicago sativa</i> L)\u2013alfalfa, and (3) organic perennial pasture. Nitrogen (N) fertilization consisted of sidedress urea ammonium nitrate for conventional corn (168 kg N ha<sup>\u22121</sup>) and spring-applied composted manure for organic corn (168 kg N ha<sup>\u22121</sup>) and oats (56 kg N ha<sup>\u22121</sup>). The dataset comprises of monthly values of subsurface drainage discharge, flow weighted nitrate concentrations, and the mass of nitrate-nitrogen (NO3-N) in drainage discharge for each of 30 corresponding experimental plots from 2014 to 2020. Dataset also includes annual harvested grain yields corrected to standard moisture content and above-ground biomass yields (excluding grain).</p><p dir=\"ltr\">Resources in this dataset:</p><ul><li>Resource Title: Field Operations.xlsx. Metadata information describing management practices and operations for each crop each year.</li><li>Resource Title: NitrateLoad_SubsurfaceDrainage_FWNC.csv. This dataset provides monthly values of Nitrate-N load, subsurface drainage discharge, and flow weighted nitrate concentrations from 2014 to 2020.</li><li>Resource Title Set: Yield_Alfalfa.csv, Yield_ConvCorn.csv, Yield_ConvSoybean.csv, Yield_Oat.csv, Yield_OrgCorn.csv, and Yield_OrgSoybean.csv. These datasets provide biomass and grain yields of conventional soybean and corn, organic soybean, corn, oats and alfalfa from 2014-2020.</li><li>Resource Title: Precipitation.csv. Cumulative monthly precipitation for the study location, 2014-2020. Monthly values were calculated from daily values from the Iowa Environmental Mesonet (<a href=\"https://gcc02.safelinks.protection.outlook.com/?url=https://mesonet.agron.iastate.edu/request/coop/fe.phtml&data=05|02|Andrew.McLaughlin@usda.gov|337be1ea0e1a4ce5b3e208de7941047e|ed5b36e701ee4ebc867ee03cfa0d4697|1|0|639081517313761125|Unknown|TWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ==|0|||&sdata=sYlh8F3XAnxvphOMd7eBeR6NyC4+YYvWtxBVqab9CYM=&reserved=0\" target=\"_blank\">https://mesonet.agron.iastate.edu/request/coop/fe.phtml</a>).</li></ul><p><br></p>", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://geodata.nal.usda.gov/geonetwork/srv/api/records/ff5c171d-8064-461b-a93b-54d09b6c3ccd/formatters/xml", "conformsTo": "https://www.isotc211.org/2005/gmd", "format": "xml", "mediaType": "text/xml", "title": "Geodata ISO 19139 metadata"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015176", "format": "csv", "mediaType": "text/csv", "title": "Metadata_NitrateLoad_SubsurfaceDrainage_FWNC.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015179", "format": "csv", "mediaType": "text/csv", "title": "NitrateLoad_SubsurfaceDrainage_FWNC.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015182", "format": "csv", "mediaType": "text/csv", "title": "Precipitation.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015185", "format": "csv", "mediaType": "text/csv", "title": "Yield_Alfalfa.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015188", "format": "csv", "mediaType": "text/csv", "title": "Yield_ConvCorn.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015191", "format": "csv", "mediaType": "text/csv", "title": "Yield_ConvSoybean.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015194", "format": "csv", "mediaType": "text/csv", "title": "Yield_Oat.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015197", "format": "csv", "mediaType": "text/csv", "title": "Yield_OrgCorn.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62015200", "format": "csv", "mediaType": "text/csv", "title": "Yield_OrgSoybean.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62313466", "format": "xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "Field Operations.xlsx"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/62313808", "format": "csv", "mediaType": "text/csv", "title": "Metadata_Yield.csv"}], "identifier": "10.15482/USDA.ADC/31370134.v1", "keyword": ["Iowa", "alfalfa", "corn", "drainage water", "grain yields", "nitrate", "nitrogen", "oats", "organic farming", "pasture", "soybean", "subsurface drainage"], "license": "https://www.usa.gov/publicdomain/label/1.0/", "modified": "2026-03-18", "programCode": ["005:040"], "publisher": {"@type": "org:Organization", "name": "Agricultural Research Service"}, "spatial": "{\"type\": \"Point\", \"coordinates\": [-93.76698, 42.01944]}", "temporal": "2014-01-01/2020-12-31", "theme": ["geospatial"], "title": "Data from: Organic production reduces subsurface nitrate leaching and maintains crop yields in US Mollisol"}