Influence of crop rotation and different fertilization systems on chromatographic properties of humic acids in soil
2009
Kondratowicz-Maciejewska, K., University of Technology and Life Sciences, Bydgoszcz (Poland) | Banach-Szott, M., University of Technology and Life Sciences, Bydgoszcz (Poland)
Humification is a complex process of decomposition, transformation and synthesis of different organic compounds which leads to the formation of new humus substances referred to as humus. The characteristics of humus substances are provided based on the examination of the properties of soil extracts obtained with selective solvents. An important analytical method which facilitates getting to know more about these compounds is High Performance Liquid Chromatography (HPLC). The aim of the present paper was to investigate the effect of agrotechnical practises, including crop rotation and fertilisation, on the hydrophilic and hydrophobic properties and the degree of polydispersity of humic acids. The present results of the chromatographic analysis show that the structure of humic acids is mostly determined by the soil type. However, there was noted an effect of the crop rotation on the share of hydrophilic and hydrophobic fractions and low- and high-molecular fractions in the humic acids analysed. Enriching soil with humus by an adequate selection of the crops results in an obvious increase in the content of hums substance at the initial stage of decomposition, which is confirmed by the occurrence of the so-called young humic acids of a lower molecular weight and a lower degree of aromatic structure condensation.
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