No. I (2010): Journal Of Agricultural Sciences - Supplement
Articles

Effects of long-term K fertilization and liming on the extractable and exchangeable K contents of a Haplic Phaeosem soil

Published October 5, 2010
Emese Berta-Szabó
1Department of Agricultural Chemistry and Soil Science of the Centre for Agricultural and Applied Economic Sciences, University of Debrecen (Hungary)
György Zsigrai
Karcag Research Institute of the Centre for Agricultural and Applied Economic Sciences, University of Debrecen (Hungary)
Anita Szabó
1Department of Agricultural Chemistry and Soil Science and of the Centre for Agricultural and Applied Economic Sciences, University of Debrecen (Hungary)
Jakab Loch
1Department of Agricultural Chemistry and Soil Science and of the Centre for Agricultural and Applied Economic Sciences, University of Debrecen (Hungary)
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APA

Berta-Szabó, E., Zsigrai, G., Szabó, A., & Loch, J. (2010). Effects of long-term K fertilization and liming on the extractable and exchangeable K contents of a Haplic Phaeosem soil. Acta Agraria Debreceniensis, (I), 141–145. Retrieved from https://ojs.lib.unideb.hu/actaagrar/article/view/8392

Effects of regular K fertilization and liming on the easily extractable K content of a Haplic phaeosem soil determined in 0.01 M CaCl2
and AL (traditional method in Hungary) were examined in the B1740 type of the National Uniformed Long-Term Fertilization Experiments
at Karcag.
Close correlation (r=0.95) was found between the 0.01 M CaCl2 and ammonium lactate - acetic acid (AL) extractable K contents of
soils.
K fertilization increased the amount of 0.01 M CaCl2 and AL extractable K significantly. Liming had different effects on the amounts of
K extracted by these two methods. Liming increased the amount of AL-K and decreased the amount of CaCl2-K. CaCl2 extractable K was in
close correlation with the relative amount of exchangeable K content of the soil (K%) and the agronomic K balance. The results of regression
analysis confirmed that the CaCl2-K characterized K% and the AL-K related to the absolute amount of exchangeable K.
On the basis of the presented results it can be stated that the 0.01 M CaCl2 is able to detect not just the increase of easily extractable K
caused by fertilization and liming but the changing of the rate of the relative amount of exchangeable K.

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