During the operation of rice irrigation systems, the conditions for the genesis and soil formation of landscapes are cardinally violated. This leads to the leaching of active humus and calcium, colloidal particles, nutrients from the arable layer into the underlying horizons, resulting in a tendency to secondary salinization and alkalinization of soils. The development of the eluvial-gley process and the change in the physicochemical parameters of soils cause a change in the morphological soil profile. The likelihood of negative consequences is associated with the specifics of the rice irrigation system. This probability depends on the following factors: flooding of rice paddies, drainage, fertilization, rising groundwater levels, siltation of canals, wear of engineering equipment. Currently, the problems of preventing land degradation, soil surveys and monitoring the position of the groundwater level and the degree of their mineralization, maintaining and restoring soil fertility are topical. In the article, according to the data of the field experiment, the authors calculated the characteristics of the thickness of the humus horizon of the rice field - the sample variance, the coefficient of variation and the range of variation. The performed calculations are necessary in the development of recommendations for ensuring the optimal water-salt regime of the root layer and the aeration zone, in determining the content of nutrients in soil and soil - humus, total nitrogen, phosphorus and potassium, in studying the hydrochemical composition of irrigation and drainage waters, in determining the qualitative the composition of salts and the degree of toxicity of ions contained in the soil. The proposed method for assessing the reclamation state of soils can serve as a basis for the development of computer programs to preserve and improve environmental safety in the rice irrigation system.