{"@type": "dcat:Dataset", "accessLevel": "public", "accrualPeriodicity": "irregular", "bureauCode": ["005:18"], "contactPoint": {"fn": "Liebig, Mark A.", "hasEmail": "mailto:mark.liebig@usda.gov"}, "description": "<p dir=\"ltr\">Understanding long-term management effects on soil properties is necessary to determine the sustainability of cropping systems. Documentation of soil property responses to corn-based cropping systems in the Western Corn Belt, however, is limited. A study was conducted near Mead, Nebraska to document the effects of four crop sequences (continuous corn, corn-soybean, corn-oat+clover-grain sorghum-soybean, corn-soybean-grain sorghum-oat+clover) and three nitrogen (N) rates (zero, low, high) on a suite of soil properties. At the time of sampling (spring 1999), treatments had been in place for 16 years. Soil samples were collected from two depths using a 1.8 cm step-down probe: 0-7.6 cm and 0-30.5 cm. Soil pH and electrical conductivity was estimated from a 1:1 soil-water mixture. Soil nitrate-N was measured using 1:10 soil-KCl extracts and the cadmium reduction method. Extractable P was determined by the Bray P-1 method. Particulate organic matter was determined by weight loss-on-ignition. Total carbon and N were determined by dry combustion. Potentially mineralizable N was determined by anerobic incubation, while microbial biomass was estimated by microwave irradiation. Soils data were used to identify associations with 16-year averages of grain and stover yield, grain and stover N uptake, and post-harvest soil nitrate-N. Data may be used to understand soil responses to corn-based cropping systems under rainfed conditions in a humid continental climate. Applicable USDA soil types include Yutan, Tomek, and Fillmore.</p>", "distribution": [{"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822843", "format": "xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "WCBCropSys_Data Dictionary.xlsx"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822846", "format": "xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "WCBCropSys_Soil_0-7.6cm.xlsx"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822849", "format": "xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "WCBCropSys_Soil_0-30.5cm.xlsx"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822852", "format": "xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "WCBCropSys_Soil&Crop.xlsx"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822855", "format": "csv", "mediaType": "application/csv", "title": "WCBCropSys_Soil_0-7.6cm_Data.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822858", "format": "csv", "mediaType": "text/plain", "title": "WCBCropSys_Soil_0-7.6cm_Metadata.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822861", "format": "csv", "mediaType": "application/csv", "title": "WCBCropSys_Soil_0-30.5cm_Data.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822864", "format": "csv", "mediaType": "text/plain", "title": "WCBCropSys_Soil_0-30.5cm_Metadata.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822867", "format": "csv", "mediaType": "application/csv", "title": "WCBCropSys_Soil&Crop_Data.csv"}, {"@type": "dcat:Distribution", "downloadURL": "https://ndownloader.figshare.com/files/46822870", "format": "csv", "mediaType": "text/plain", "title": "WCBCropSys_Soil&Crop_Metadata.csv"}], "identifier": "10.15482/USDA.ADC/25954171.v1", "keyword": ["Corn production", "Crop rotation", "Fertilization rate", "Long-term research"], "license": "https://creativecommons.org/publicdomain/zero/1.0/", "modified": "2025-11-21", "programCode": ["005:040"], "publisher": {"@type": "org:Organization", "name": "Agricultural Research Service"}, "spatial": "{\"type\": \"Point\", \"coordinates\": [-96.41867, 41.16719]}", "temporal": "1999-04-01/1999-04-30", "title": "Data from:  Crop Sequence and Nitrogen Fertilization Effects on Soil Properties in the Western Corn Belt"}