Chemodestructive fractionation of humus as an indicator of the functional state of soil organic matter

The content, composition, and properties of humus are the most important characteristics that reflect features modern soil formation, genesis evolution soils, their agrogenic transformation. main criteria for assessing fertility traditionally content reserves organic matter in soils. At same time, decrease is associated not so much with a total humus, but loss its labile forms, which determine life soil, agronomic crop yields. One integral indicators characterizing state functioning (SOM) ratio stable forms compounds obtained by chemodestructive analysis. determination bichromate oxidizability showed virgin soils Southern Cis-Baikal region contain an equal amount compounds. Accordingly, them balanced system relation to external influences. Plowing led significant easily hardly hydrolysable fractions. In fallow areas, upper part horizon, terms fractions, approaches lower arable horizons agricultural method permanganate revealed noticeable enrichment oxidizable and, especially, region. Compared them, contained noticeably less indicates sharp fertility.