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update: {"nested_updated_at"=>[nil, Mon, 13 Jun 2022 21:54:00.859577000 UTC +00:00]}
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2024-01-03T18:24:05Z
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update: {"description"=>["This dataset includes five files developed using the procedures described by the article 'Developing County-level Data of Nitrogen Fertilizer and Manure Inputs for Corn Production in the United States' and Supplemental Information published in the Journal of Cleaner Production in 2021.\r\n", "This dataset includes five files developed using the procedures described in the article 'Developing County-level Data of Nitrogen Fertilizer and Manure Inputs for Corn Production in the United States' and Supplemental Information published in the Journal of Cleaner Production in 2021.\r\nCitation: Xia, Yushu, Hoyoung Kwon, and Michelle Wander. \"Developing county-level data of nitrogen fertilizer and manure inputs for corn production in the United States.\" Journal of Cleaner Production 309 (2021): e126957.\r\nBrief method: The fertilizer and manure inputs for corn were generated with a top-down approach by assigning county-level total N inputs reported by USGS to different crops using state- and county-level survey data. The corn N needs were estimated using empirical extension-based equations coupled with soil and environmental covariates. The estimates of fertilizer N inputs were further refined for corn grain and silage production at the county level and gap-filling (using state-level averages) was carried out to generate final files for U.S. county-level N inputs.\r\nThe dataset is provided in an alternative format in Google Earth Engine: https://code.earthengine.google.com/13a0078e7ee727bc001e045ad0e8c6fc"], "keywords"=>["Corn; Nitrogen Fertilizer; Manure; Countermonius US", "Corn; Nitrogen Fertilizer; Manure; Conterminous U.S."]}
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2022-06-13T21:53:01Z
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