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Estimation of Some Chemical Properties of an Agricultural Soil by Spectroradiometric Measurements

机译：分光光度法估算农业土壤的某些化学性质

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摘要

The contents of nitrogen and organic carbon in an agricultural soil were analyzed using reflectance measurements (n = 52) performed with an ASD FieldSpec-Ⅱspectroradiometer.For parameter prediction,empirical models based on partial least squares (PLS) regression were defined from the measured reflectance spectra (0.4 to 2.4 μm).Here,reliable estimates were obtained for nitrogen content,but prediction accuracy was only moderate for organic carbon.For nitrogen,the real spatial pattern of within-field variability was reproduced with high accuracy.The results indicate the potential of this method as a quick screening tool for the spatial assessment of nitrogen and organic carbon,and therefore an appropriate alternative to time-and cost-intensive chemical analysis in the laboratory.
机译：使用ASDFieldSpec-Ⅱ分光光度计进行反射率测量（n = 52）分析农业土壤中的氮和有机碳含量。为进行参数预测，从测得的反射率定义了基于偏最小二乘（PLS）回归的经验模型光谱（0.4到2.4μm）。在这里，获得了可靠的氮含量估算值，但对有机碳的预测准确度仅中等。对于氮，场内变异性的真实空间格局得以高精度再现。这种方法作为一种快速筛选工具进行氮和有机碳空间评估的潜力，因此可以替代实验室中耗时费钱的化学分析方法。

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