Corn stover removal responses on soil test P and K levels in Coastal Plain Ultisols

This is digital research data corresponding to a published manuscript, Corn stover removal responses on soil test P and K levels in Coastal Plain Ultisols, in Sustainability. 2021. 13:4401. Corn (Zea mays L.) stover is used as a biofuel feedstock in the U.S. Selection of stover harvest rates for soils is problematic, however, because excessive stover removal may have consequences on plant available phosphorus (P) and potassium (K) concentrations. Our objective was to quantify stover harvest impact on soil P and K concentrations in the southeastern U.S. Coastal Plain. Five stover harvest rates (0, 25, 50, 75 and 100 percent by weight) were removed for five years (2008 to 2012) from replicated plots on highly weathered, toposequential Coastal Plain Ultisols. Grain and stover mass with P and K concentration data were used to calculate nutrient removal. Mehlich 1 (M1) extractable P and K concentrations and bulk density were used to monitor changes within the soil.本数字化研究数据集对应一篇已发表的学术论文，论文题为《沿海平原老成土（Ultisols）中玉米秸秆移除对土壤速效磷与钾素水平的影响》，发表于《Sustainability》2021年，第13卷，第4401篇。 玉米（Zea mays L.）秸秆在美国被用作生物燃料原料。然而，针对不同土壤确定适宜的秸秆收获率颇具挑战性，因为过度移除秸秆可能会改变土壤中植物有效磷（P）与钾（K）的浓度。本研究旨在量化秸秆收获对美国东南部沿海平原老成土中土壤磷、钾浓度的影响。研究在高度风化、按地形序列分布的沿海平原老成土上设置重复试验小区，连续5年（2008至2012年）移除5种梯度的秸秆（按重量计分别为0%、25%、50%、75%和100%）。通过采集籽粒与秸秆生物量及其磷、钾含量数据，计算养分移除量；采用梅利奇1浸提法（Mehlich 1, M1）测定土壤速效磷与钾含量，并结合容重指标监测土壤变化。