DOI: 10.5593/SGEM2016/B32/S13.042


L. Zarina, L. Zarina, V. Seglins
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-62-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 2, 319-324 pp

Soil reaction (pH) was studied basing on data from long-term monitoring field in north-eastern part of Latvia in Priekuli and data of period from 1962 to 2000 were analyzed more in detail. Measurements were taken from the soil ploughing layer in autumn after basic crop harvesting and they show significant changes of soil pH, reflecting the increase of the soil acidity on more than one pH unit.
The obtained data indicate a trend of the pH change which in the observation period is close to linear. However, the measurement data curve shows also highs and lows that are not related to unusual weather conditions and field fertilization. The data indicate that most likely the short-term pH changes are related to the changes of geochemical balance, soil liquids and soil inorganic compounds interactions reaching relative equilibrium at level of 5.5 pH units. At the same time, the observed periods of linear transition likely reflect one of the stages of the natural cyclical changes.

Keywords: Soil geochemical balance, soil monitoring, soil pH

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