Fractional and group humus composition of the sod-podzolic soils under different land use

doi: 10.30766/2072-9081.2018.65.4.82-86.

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N.E. Zavyalova, DSc in Biology, Head of the Laboratory, e-mail: nezavyalova@gmail.com,
D.S. Fomin, PhD in Agriculture, Head of the Laboratory,
I.S. Teterlev, research officer
Perm Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Perm, Russian Federation, e-mail: pniish@rambler.ru

In a long-term stationary experiment in Perm region the change in the quality of humus in sod-podzolic soil under long-term (40 years) land-use (continuous bare fallow, permanent barley and winter rye, crop rotation with various percent of leguminous grasses – 0; 28.6 and 42.9 % lea ) was studied. It was found that the long-term bare fallow causes a decrease in the total content of humic acids, mainly the most mobile fraction of HA-1, and the ac-cumulation of fulvic acids (CHA : CFA = 0.55). When permanently cultivating crops in crop rotation, the content of humic acids increases due to the accumulation of fractions of HA-1 and HA-2 and the displacement of the type of humus formation from fulvate to humate-fulvate, with an increase in the ratio of CHA: CFA to 0.70-0.79. The use of manure makes it possible to fertilize the soil with fractions of humic acids, both easily mobile (HA-1) and calcium-bound (HA-2), thereby increasing the "maturity" of humus and resistance to mineralization. The introduction of organic and mineral fertilizers under monocultures and in crop rotations with a different proportion of legumes leads to the accumulation of calcium humates (HA-2) to 0.14-0.25 % of the soil mass. Transformation of arable soil into the fallow soil promotes the accumulation of valuable for agriculture fractions of humus - humic acids and reduction of fulvic acids, СHA: СFA = 0.96.

Keywords: crop rotation, continuous bare fallow, permanent crops, lea, fertilizers

For citation:

Zavyalova N.E., Fomin D.S., Teterlev I.S. Fractional and group humus composition of the sod-podzolic soils under different land use // Agrarnayа nauka Evro-Severo-Vostoka. 2018. Vol. 65. no. 4. pp. 82-86. doi: 10.30766/2072-9081.2018.65.4.82-86.