Humus content and composition in the solodic soil
2004
Nesic, Lj.(Poljoprivredni fakultet, Novi Sad (Serbia))
Following conclusions have been drawn on the basis of an in-depth study of the content and composition of humus in the soil designated as solodic in the soil map of the Vojvodina Province (R 1:50,000), Serbia. The mean content of humus in Aoh horizons of solodic soil 1 indicated their high humosity (4.43% of humus), which may be explained by the presence of abundant but shallow grassy vegetation cover. The compound Aoh/Eg horizons of solodic soil 2 are moderately provided with humus (2.73%). Humus content drops abruptly with further increase in depth. The mean content of extracted humus acids increased with depth. It reached the highest value in the Btg horizon, to gradually decreased therefrom. The ratio of humic : fulvic acids was unfavourable, especially in the Btg horizon where the portion of fulvic acid was greater than that of humic acids, i.e., Ch/Cf ratio was below unity (from 0.61 to 0.64) . The increased portion of humus acids in Btg horizons of the solodic soil is due to the unfavourable composition of these acids (higher portion of mobile fulvic acids compared with humic acids), indicating the presence of eluviation/illuviation processes which are integral parts of the solodization process.
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