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

  141-145

  Emese Berta-Szabó

  György Zsigrai

  Anita Szabó

  Jakab Loch

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  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.