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• W2200752703 abstract "Rapid determination of soil organic matter (SOM) using regression models based on soil reflectance spectral data serves an important function in precision agriculture. “Deviation of arch” (DOA)-based regression and partial least squares regression (PLSR) are two modeling approaches to predict SOM. However, few studies have explored the accuracy of the DOA-based regression and PLSR models. Therefore, the DOA-based regression and PLSR were applied to the visible near-infrared (VNIR) spectra to estimate SOM content in the case of various dataset divisions. A two-fold cross-validation scheme was adopted and repeated 10 000 times for rigorous evaluation of the DOA-based models in comparison with the widely used PLSR model. Soil samples were collected for SOM analysis in the coastal area of northern Jiangsu Province, China. The results indicated that both modelling methods provided reasonable estimation of SOM, with PLSR outperforming DOA-based regression in general. However, the performance of PLSR for the validation dataset decreased more noticeably. Among the four DOA-based regression models, a linear model provided the best estimation of SOM and a cutoff of SOM content (19.76 g kg−1), and the performance for calibration and validation datasets was consistent. As the SOM content exceeded 19.76 g kg−1, SOM became more effective in masking the spectral features of other soil properties to a certain extent. This work confirmed that reflectance spectroscopy combined with PLSR could serve as a non-destructive and cost-efficient way for rapid determination of SOM when hyperspectral data were available. The DOA-based model, which requires only 3 bands in the visible spectra, also provided SOM estimation with acceptable accuracy." @default.
• W2200752703 created "2016-06-24" @default.
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• W2200752703 date "2016-02-01" @default.
• W2200752703 modified "2023-10-17" @default.
• W2200752703 title "Estimation of Organic Matter Content in Coastal Soil Using Reflectance Spectroscopy" @default.
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• W2200752703 doi "https://doi.org/10.1016/s1002-0160(15)60029-7" @default.
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