Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

Copyright © Wydawnictwo Akademii Rolniczej we Wroclawiu, ISSN 1505-0297

Diatta J. , Kociałkowski Z. , Grzebisz W. 2006. EVALUATION OF POTASSIUM QUANTITY-INTENSITY PARAMETERS OF SELECTED POLISH AGRICULTURAL SOILS, EJPAU 9(4), #26.
Available Online: http://www.ejpau.media.pl/volume9/issue4/abs-26.html

ABSTRACT

Potassium exchange-equilibrium parameters were outcome from quantity-intensity (Q/I) isotherms, i.e. K equilibrium activity ratio (), equilibrium potential buffering capacity for K (), K labile (K_Lab), free energy of K replenishment (); non-specific (K_x) and specific (ΔK_equ) potassium, preferential factor () and the Gapon selectivity coefficient (k_G). It was found that soils did not generally differ in their exchangeable potassium (K_ex) but did for % K saturation as an estimate of K lability. Potassium was differently controlled by soil properties of which organic carbon (C_org) exhibited weak relationships with most of Q/I parameters. Potassium activity () was controlled more by silt (r = 0.97^**** P < 0.001), Fe (DCB and Ox, r = 0.81^*** and r = 0.71^***, P < 0.005, respectively) and Mn (DCB and Ox, r = 0.70^*** and r = 0.71^***, P < 0.005, respectively) than by the cation exchange capacity (CEC) and exchangeable cations (r = 0.50^*, P < 0.05, on average). Of mineral soil constituents, it was found that Fe and Mn oxides also significantly influenced the free energy of changes ( with 0.75^***≤ r ≥ 0.63^**). This implies that studies on potassium dynamics of soils should additionally consider the level of Fe and Mn, as well. Most of the Gapon selectivity coefficients (k_G) (i.e. 80%) fluctuated within the range 3.87-4.96 (dm³·mol^-1)^1/2, suggesting that the relative affinity for K was quite similar, irrespective of the degree of K saturation. The latter one along with the pool of labile K (K_Lab) indicated that soils will sufficiently support plant cropping without any threat of K shortage, as stated by the values.

Key words: potassium, quantity-intensity, activity ratio, potential buffering capacity, free energy of change, Gapon selectivity coefficient, preferential factor .

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Jean Bernard Diatta
Department of Agricultural Chemistry and Environmental Biogeochemistry,
Poznań University of Life Sciences, Poland
Wojska Polskiego 71F, 60-625 Poznań, Poland
email: jeandiatta63@yahoo.com

Zdzisław Wacław Kociałkowski
Department of Agricultural Chemistry,
Poznan Agricultural University, Poland
Wojska Polskiego 71F, 60-625 Poznan, Poland

Witold Grzebisz
Department of Agricultural Chemistry,
Poznan Agricultural University, Poland
Wojska Polskiego 71F, 60-625 Poznan, Poland
email: witegr@au.poznan.pl

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Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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