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Reflectance spectroscopy techniques in the ultraviolet, visible, near-infrared and mid-infrared regions are alternatives for many traditional laboratory methods for measuring soil properties. However, debate exists over whether the near-infrared (700–2500 nm) or the mid-infrared (MIR, 2500–25000 nm) region of the electromagnetic spectrum is more useful for predicting soil properties. Therefore, the aim of this study was to compare UV-VIS-NIR and MIR spectroscopic techniques to predict several soil properties. A total of 415 surface and subsurface soil samples were collected from widely spread locations within New South Wales and south-eastern Queensland of Australia to model the proposed hypothesis. Principal component regression analysis (PCR) was used to develop calibration and validation models from soil spectra and reference laboratory values. The models developed using MIR spectra achieved higher prediction accuracy (regression coefficient, r2 = 0.62–0.85) for pH, organic carbon, clay, sand, CEC, and exchangeable Ca and Mg than that obtained by UV-VIS-NIR spectra (r2 = 0.28–0.76). PCR models were also developed for the combined spectral regions (UV-VIS-NIR+MIR). The models developed using combined spectra were also found to predict pH, organic carbon, clay, sand, CEC, and exchangeable Ca and Mg with acceptable accuracy (r2 = 0.59–0.79). The results of this study indicate that MIR spectra are better than UV-VIS-NIR spectra for estimation of common soil properties.

Item Type:	Refereed Article
Keywords:	reflectance spectroscopy, non-destructive technique, soil testing
Research Division:	Environmental Sciences
Research Group:	Soil sciences
Research Field:	Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
Objective Division:	Environmental Management
Objective Group:	Terrestrial systems and management
Objective Field:	Soils
UTAS Author:	Pirie, A (Mr Adam Pirie)
ID Code:	66508
Year Published:	2005
Web of Science® Times Cited:	96
Deposited By:	Pharmacy
Deposited On:	2011-02-01
Last Modified:	2011-05-10
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