Year 2023, Volume 8, Issue 2
| Year : | 2023 |
| Volume : | 8 |
| Issue : | 2 |
| Authors : | Nina ZAVYALOVA, Marina VASBIEVA, Konstantin KORLYAKOV, Denis FOMIN |
| Title : | ELEMENTAL COMPOSITION AND STRUCTURE OF HUMIC ACIDS IN SOD-PODZOLIC ARABLE SOIL AND ITS VIRGIN ANALOGUES IN LONG-TERM STATIONARY EXPERIMENT |
| Abstract : | The effect of crop rotations with different saturation by legumes (0; 28.6; 42.9 percent of legumes) and continuous barley on the elemental composition and structure of humic acids in sod-podzolic heavy loamy soil (Eutric Albic Retisols (Abruptic, Loamic, Cutanic) was studied in long-term (since 1977) stationary experiment in Perm Region. The arable soil was compared with virgin analogues (under mixed forest, poaceous-forb meadow) and neglected field. The carbon content in humic acids of arable and virgin sod-podzolic soil was 28.3-33.5, hydrogen 40.1-47.5, oxygen 19.6-27.9, nitrogen 2.1-2.5 and sulfur 0.1-0.2 percent. The differences in humic acids composition of arable and virgin soils result from the qualitative composition of the organic soil material, its amount and the intensity of anthropogenic impact. The saturation of field crop rotation with legumes up to 42.9 percent caused the raising the aliphatic groups share in the structure of soil humic acids (the maximum H / C ratio 1.67 was noted). Using five-field grain rotation promoted the increasing of stable aromatic structures and nitrogen decline in humic acids (the minimum H / C ratio 1.20 and maximum C / N ratio 16.2 was noted). The highest content of oxygen-containing groups and high degree of humic acid oxidation (W = + 0.53), were found in humic acids of neglected field soil (C / O - 0.95). That may indicate the most favorable conditions for the humification of organic matter. According to the results of Fourier IR spectroscopy, the most branched structure, consisting from large amount of individual monomers of various molecular weights with a large number of aliphatic groups, had humic acids in soil under crop rotation with high legumes saturation and soil under mixed forest. Aromatic structures were more intensely expressed in humic acids spectra of the soil under conventional crop rotation and continuous barley. |
| For citation : | Zavyalova, N., Vasbieva, M., Korlyakov, K., Fomin, D. (2023). Elemental composition and structure of humic acids in sod-podzolic arable soil and its virgin analogues in long-term stationary experiment. AGROFOR International Journal, Volume 8. Issue No. 2. pp. 46-60. DOI: 10.7251/AGRENG2302046Z |
| Keywords : | humic acids, elemental analysis, IR spectroscopy, crop rotation, neglected field, continuous barley. |
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ISSN 2490-3434 (Printed)
ISSN 2490-3442 (Online)
ISSN 2490-3442 (Online)
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