Krylov V.A., Mamontov V.G.

Influence of the peculiarities of using typical chernozem of the Kursk region on the molecular weight composition of labile humus substances

The results obtained indicate that LHS (labile humus substances) of typical chernozem are polydisperse compounds. Under the influence of agricultural use, the dispersion of LHS increases, and the molecular weight composition of LHS is trans-formed towards the accumulation of fractions with lower molecular weights in their composition. As a result, the number average molecular weight of LHS decreases from 15230 amu. in LHS virgin chernozem up to 11180-12770 amu. near LHS chernozem under permanent crops and fallow. The replacement of permanent steam with a deposit does not fundamentally affect the degree of dispersion of LHS and the values of the molecular weights of the fractions. There is only a tendency towards an increase in the relative content of fractions with high molecular weights. This is reflected in the value of the average molecular mass of LHS, which increased from 11180 amu in the variant with permanent vapor to 12530 amu. LHS has deposits.

Keywords:TYPICAL CHERNOZEM, GEL-CHROMATOGRAM, FRACTION, MOLECULAR MASS OF FRACTION, AVERAGE MOLECULAR MASS, LGS (LABILE HUMUS SUBSTANCES)