Effects of long-term K fertilization and liming on the extractable and exchangeable K contents of a Haplic Phaeosem soil
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Kötet címe (évfolyam száma)
Kiadó
Faculty of Agricultural and Food Sciences and Enviromental Management of the Debrecen University, Debrecen.
Absztrakt
Leírás
Effects 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.
Kulcsszavak
long-term experiment, 0.01 M CaCl2 extractable K content of soil, Haplic phaeosem soil