{
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  "accrualPeriodicity": "irregular",
  "bureauCode": [
    "005:18"
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  "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>",
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      "title": "WCBCropSys_Data Dictionary.xlsx"
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    },
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      "mediaType": "application/csv",
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    },
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      "title": "WCBCropSys_Soil_0-30.5cm_Metadata.csv"
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    {
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      "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"
}