ABSTRACT
NIR spectroscopy appears as a rapid, convenient and simple nondestructive technique that can be used to quantify several soil properties in many researches . However, above studies provided the dried and crushed soil samples in the experiment so that the results obtained could not be directly used to realtime evaluate soil parameters. Hence, it was important to reveal the feasibility and possibility of analyzing soil parameter with NIR spectroscopic techniques using raw soil samples. Li Minzan, A. Sasao, and S. Shibusawa have taken Kanto Loam as the research object and developed some estimation models of soil parameters based on spectral reflectance of raw soil samples. In addition, research showed that NIR spectral of soil was largely affected by soil type. The grey-brown alluvial soil is a main soil type in the Northern China. It would be necessary to study the correlation between NIR spectral and reflectance soil parameters of the grey-brown alluvial soil. Thus, the grey-brown alluvial soil in the Northern China was selected as research object, and the estimation models of soil moisture content, SOM, and TN were developed with NIR spectra of raw soil samples.
