Interannual dynamics of available potassium in a long-term fertilization experiment
M. Madaras, J. Lipavskýhttps://doi.org/10.17221/34/2009-PSECitation:Madaras M., Lipavský J. (2009): Interannual dynamics of available potassium in a long-term fertilization experiment. Plant Soil Environ., 55: 334-343.
Dynamics of the plant-available potassium (K) has been studied in polyfactorial long-term fertilization experiments since 1980. The fertilization scheme includes 10 combinations of K muriate and farmyard manure application rates (annually 0–230 kg K/ha). At medium treatment (annually 153 kg K/ha), the K balance within an 8-year crop rotation reflected crop specific K application rates with positive annual balances in years of growing silage maize and sugar beet (high K input), and negative in two years of growing alfalfa. Available K clearly corresponded to the dynamics of the K balance, with statistically significant fluctuations from 88 to 149 mg K/kg within one crop rotation cycle. Periodic fluctuations of available K induced by crop rotation were observed also in non-fertilized treatments. The variability of available K contents was influenced primarily by crop plants and experimental unexplained factors; interannual weather fluctuations and field differences were of low significance. In the paper, the importance of interannual K dynamics for the construction of correct long-term time trends is shown and discussed.Keywords:long-term experiments; potassium; soil; nutrient balance; crop station