Effects of long-term K fertilization and liming on 0.01m CaCl2 extractable K content of a Haplic…

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Article Title:	Effects of long-term K fertilization and liming on 0.01m CaCl2 extractable K content of a Haplic phaeosem soil
Authors:	Emese Berta-Szabó*, Sándor Berényi, Rita Kremper, Jakab Loch
Affiliation:	Department of Agricultural Chemistry and Soil Sciences, Institute of the Centre for Agricultural and Applied Economic Sciences, University of Debrecen (Hungary)
Abstract:	Effects of regular K fertilization and liming on the easily available K content of a Haplic phaeosem soil determined in 0.01 M CaCl2 were examined in the B1740 type of the National Uniformed Long-Term Fertilization Experiment at Karcag. Close correlation (r=0.95) were found between the 0.01M CaCl2 and ammonium lactate acetic acid (AL; traditional method of Hungary) extractable K contents of soils. K fertilization increased significantly the amount of 0.01M CaCl2 extractable K. Liming decreased the amount of CaCl2-K. We can explain this by the changing of the rate of exchangeable K compared to exchangeable bases. CaCl2 extractable K was in good agreement with the exchangeable K content of soil and the agronomic K balance. We can conclude that CaCl2 method is suitable for the precise estimation of nutrient requirements.
Keywords:	long-term experiment, extractable K, Haplic phaeosem soil
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*Correspondence:	Berta-Szabó Emese, University of Debrecen, Institute of the Centre for Agricultural and Applied Economic Sciences, Department of Agricultural Chemistry and Soil Sciences, no. 138 Böszörményi St., 4032, Debrecen, Hungary, Tel. +36-52-508-444/88207, e-mail: szaboemese@agr.unideb.hu