FIELD: soil science and agrochemistry. SUBSTANCE: method includes reaction of oxidizers of different oxidation power with a number of averaged samples of soil. Used as oxidizers are solutions of potassium dichromate with same concentration of 0.4 N in final volume and rising oxidation power created by use of series of solutions of sulfuric acid whose concentration in final volume amounts to 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50% by volume. EFFECT: extended range of determined fractions of humus types. 2 dwg, 3 tbl
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