Estimating the soil clay content and organic matter by means of different calibration methods of vis-NIR diffuse reflectance spectroscopy

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dc.contributor.authorNawar, Said
dc.contributor.authorBuddenbaum, Henning
dc.contributor.authorHill, Joachim
dc.contributor.authorKozak, Jacek
dc.contributor.authorMouazen, Abdul M.
dc.date.accessioned2017-09-15T19:00:38Z
dc.date.available2017-09-15T19:00:38Z
dc.date.issued2015-08-14
dc.description.abstractThe selection of calibration method is one of the main factors influencing measurement accuracy of soil properties estimation in visible and near infrared reflectance spectroscopy. In this study, the performance of three regression techniques, namely, partial least-squares regression (PLSR), support vector regression (SVR), and multivariate adaptive regression splines (MARS) were compared to identify the best method to assess organic matter (OM) and clay content in the salt-affected soils. One hundred and two soil samples collected from Northern Sinai, Egypt, were used as the data set for the calibration and validation procedures. The dry samples were scanned using a FieldSpec Pro FR Portable Spectroradiometer (Analytical Spectral Devices, ASD) with a measurement range of 350–2500 nm. The spectra were subjected to seven pre-processed techniques, e.g., Savitzky–Golay (SG) smoothing, first derivative with SG smoothing (FD-SG), second derivative with SG smoothing (SD-SG), continuum removed reflectance (CR), standard normal variate and detrending (SNV-DT), multiplicative scatter correction (MSC) and extended MSC. The results of cross-validation showed that in most cases MARS models performed better than PLSR and SVR models. The best predictions were obtained using MARS calibration methods with CR prep-processing, yielding R2, root mean squared error (RMSE), and ratio of performance to deviation (RPD) values of 0.85, 0.19%, and 2.63, respectively, for OM; and 0.90, 5.32%, and 3.15, respectively, for clay content.en_UK
dc.identifier.citationSaid Nawar, Henning Buddenbaum, Joachim Hill, Jacek Kozak, Abdul M. Mouazen, Estimating the soil clay content and organic matter by means of different calibration methods of vis-NIR diffuse reflectance spectroscopy, In Soil and Tillage Research, Volume 155, 2016, Pages 510-522en_UK
dc.identifier.issn0167-1987
dc.identifier.urihttp://dx.doi.org/10.1016/j.still.2015.07.021
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12503
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectOrganic matteren_UK
dc.subjectClay contenten_UK
dc.subjectReflectance spectroscopyen_UK
dc.subjectPLSRen_UK
dc.subjectSVRen_UK
dc.subjectMARSen_UK
dc.titleEstimating the soil clay content and organic matter by means of different calibration methods of vis-NIR diffuse reflectance spectroscopyen_UK
dc.typeArticleen_UK

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