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A new technique applying polarized near-infrared spectroscopy is proposed for precise measurements of moisture content in soil. Diffuse reflectance spectra of seven kinds of soil samples were measured. Linear relation between the moisture content and the signal intensity due to water is lost when the moisture content of the soil is high, presumably because intense direct reflection at the sample surface interferes measurements. Application of polarized light was found to improve the precision of quantitative measurement. In the scheme, by using a polariz-ing plate for each of the incident and reflected light, p-polarized light was irradiated on a soil sample, while only the s-polarized light from the sample was detected. The technique is expected to be applicable not only for precise measurements of moisture content but also for diagnosis of texture of soil with high concentration moisture.

Development of Soil Diagnosis Technique Using Near-Infrared Spectroscopy-Applicability of Technique Using Polarized Light-