DBPapers
DOI: 10.5593/SGEM2015/B32/S13.053

THE STUDY OF THE NATURE AND REASONS OF THE INCREASING OF CONTENT OF MOBILE BORON IN SOILS IN KAZAKHSTAN

O.I. Ponomarenko, L.K. Beisembayeva, M.R.Tanasheva, I.V. Matveyeva
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 393-400 pp

ABSTRACT
Recently there were significant changes in soils of Kazakhstan, among them are dehumification and decalcification of the upper horizons of soils, increasing of the alkalinity of the soils. On the rice fields of Kazakhstan high mobile boron content were recorded, which resulted to a disease of soil called “boron toxicosis”.
It was established that the main speciation of boron are boric acid and various forms of borate ions (tetra-, hexa-, polyborates and metaborates). The most stable boron compounds were found by the data on the standard values of ΔfG0 for the reactions of formation of expected boron compounds. For calculation of ΔfG0298Mm(XαOβ)n(s) the method of increments was used. The calculation was done for such boron minerals, as Mg2[B6O11]. 15H2O, MgСа[B6O11].11H2O, KMg[B11O19]. 9H2O, Mg Ca[B6O11]. 6H2O, Mg2[B6O11]. 15H2O; Mg2[B2O5]. 3H2O, Mg3[B5O9]2. 4H2O and Mg2[B2O5]. H2O.
In order to improve the dynamics of the boron in soils of rice fields the total content and mobile form of boron, depending on the pH value of the soil environment were studied. The correlation of content of boron (total and mobile) from pH was investigated. The correlation of portion of mobile form of boron from pH was found. For the dissolution reactions of the analyzed borates in various inorganic acids were calculated.

Keywords: rice field, boron toxicosis, mobile boron, soils

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