Combining frequency domain reflectometry and visible and near infrared spectroscopy for assessment of soil bulk density

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dc.contributor.author Al-Asadi, Raed A. -
dc.contributor.author Mouazen, Abdul Mounem -
dc.date.accessioned 2014-07-11T04:00:35Z
dc.date.available 2014-07-11T04:00:35Z
dc.date.issued 2014-01-01T00:00:00Z -
dc.identifier.citation Raed A. Al-Asadi and Abdul M. Mouazen, Combining frequency domain reflectometry and visible and near infrared spectroscopy for assessment of soil bulk density, Soil and Tillage Research, Volume 135, January 2014, Pages 60–70.
dc.identifier.issn 0167-1987 -
dc.identifier.uri http://dx.doi.org/10.1016/j.still.2013.09.002 -
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/8609
dc.description.abstract This paper introduces a new approach for the assessment of soil bulk density (BD), which relies on an existed model to predict BD as a function of a visible and near infrared spectroscopy (vis-NIRS) measured gravimetric moisture content (v) and a frequency domain reflectometry (FDR) measured volumetric moisture content (uv). A total of 1013 soil samples collected from England and Wales, from 32 arable and grassland fields with different soil types were measured with a vis-NIR spectrophotometer (LabSpec1Pro Near Infrared Analyzer, Analytical Spectral Devices, Inc., USA) after in situ measurement with a ThetaProbe FDR (Delta-T Device Ltd.). Two calibration methods of the vis-NIRS were tested, namely, partial least squares regression (PLSR) and artificial neural network (ANN). ThetaProbe calibration was performed with traditional methods and ANN. ANN analyses were based on a single- variable input or multiple-variable input (data fusion). During ANN - data fusion analysis, vis-NIRS spectra and ThetaProbe output voltage (V) were fused in one matrix with or without laboratory measured texture fractions and organic matter content (OM). For the vis-NIRS and ThetaProbe traditional calibration, samples were divided into calibration (75%) and prediction (25%) sets, whereas for the ANN analyses these were divided into calibration (65%), test (10%) and independent validation (25%) sets. Results proved that high measurement accuracy can be obtained for v and uv with PLSR and the best performing traditional calibration method of the ThetaProbe with R2 values of 0.91 and 0.97, and root mean square error of prediction (RMSEp) values of 0.027 g g1 and 0.019 cm3 cm3, respectively. However, the ANN - data fusion resulted in improved accuracy (R2 = 0.98 and RMSEp = 0.014 g g1 and 0.015 cm3 cm3, respectively). This data fusion approach led to the best accuracy for BD assessment when vis-NIRS spectra and ThetaProbe V only were used as input data (R2 = 0.81 and RMSEp = 0.095 g cm3). It can be concluded that BD can be measured by combining the vis-NIRS and FDR techniques based on ANN-data fusion approach. en_UK
dc.language.iso en_UK -
dc.publisher Elsevier Science B.V., Amsterdam. en_UK
dc.rights “NOTICE: this is the author’s version of a work that was accepted for publication in Soil and Tillage Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Soil and Tillage Research, VOL 135, (2014) DOI:10.1016/j.still.2013.09.002”
dc.title Combining frequency domain reflectometry and visible and near infrared spectroscopy for assessment of soil bulk density en_UK
dc.type Article -


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