Abstract
In the article the interrelation of RI index and soil organic content is studied. Research of known model of interrelation of SOM and SOC, and also model of interrelation of SOC and R,G,B signals of colorimeter and obtained experimental data relating soil of arid and semiarid zones make it possible to derive the new formula for calculation of RI index in dependence of results of RGB colorimetric measurements of soil color. Check up of accuracy of calculation on obtained formula does show that result of calculation on new formula differ from results on known formula by 13% which taking into consideration of non-certainty of choice of any model of interrelation of SOM and SOC can be considered as acceptable. The conceptual basis for construction of conductmeter-colorymetric complex for estimation of soil organic content is described.
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