The soil moisture, organic matter and iron oxide have a considerable effect on the red soil spectrum.

This paper studied characteristics of organic spectrum indices, moisture contents, iron oxide contents and red

soil field spectrum. It is concluded that the moisture content has the most intimate relationship with the red

soil field spectrum in the infrared wave band of short wave, that the close relationship between iron oxide

contents and red soil field spectrum exists in the near-infrared wave band, and that the organic matter exerts a

significant affect on the red soil field spectrum in the visible light wave band.