County-level Data of Nitrogen Fertilizer and Manure Inputs for Corn Production in the United States

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. Citation: 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. Brief 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. The dataset is provided in an alternative format in Google Earth Engine: https://code.earthengine.google.com/13a0078e7ee727bc001e045ad0e8c6fc

本数据集包含五份文件，这些文件是根据发表于《Journal of Cleaner Production》2021年的一篇论文《Developing County-level Data of Nitrogen Fertilizer and Manure Inputs for Corn Production in the United States》及其补充信息中所描述的方法开发的。文献引用：Xia, Yushu, Hoyoung Kwon, 和 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. 简要方法：通过将美国地质调查局（USGS）报告的县级总氮输入量分配给不同作物，利用州级和县级调查数据，采用自上而下的方法生成了玉米的肥料和粪便输入量。玉米的氮需求量通过基于经验的扩展方程结合土壤和环境协变量进行估算。进一步对县级玉米籽粒和青贮生产中的肥料氮输入量进行了细化，并通过使用州级平均值进行插补，生成了美国县级氮输入的最终文件。数据集以备选格式提供在Google Earth Engine上：https://code.earthengine.google.com/13a0078e7ee727bc001e045ad0e8c6fc