2021-06-282021-06-28http://hdl.handle.net/2437/317188Effects of regular K fertilization and liming on the easily extractable K content of a Haplic phaeosem soil determined in 0.01 M CaCl2and AL (traditional method in Hungary) were examined in the B1740 type of the National Uniformed Long-Term Fertilization Experimentsat Karcag.Close correlation (r=0.95) was found between the 0.01 M CaCl2 and ammonium lactate - acetic acid (AL) extractable K contents ofsoils.K fertilization increased the amount of 0.01 M CaCl2 and AL extractable K significantly. Liming had different effects on the amounts ofK extracted by these two methods. Liming increased the amount of AL-K and decreased the amount of CaCl2-K. CaCl2 extractable K was inclose correlation with the relative amount of exchangeable K content of the soil (K%) and the agronomic K balance. The results of regressionanalysis 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 Kcaused by fertilization and liming but the changing of the rate of the relative amount of exchangeable K.application/pdfhttps://creativecommons.org/licenses/by/4.0/long-term experiment0.01 M CaCl2 extractable K content of soilHaplic phaeosem soilinfo:eu-repo/semantics/article