Interannual dynamics of available potassium in a long-term fertilization experiment

M. Madaras and J. Lipavský
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M. Madaras: Crop Research Institute, Prague, Czech Republic
J. Lipavský: Crop Research Institute, Prague, Czech Republic

Plant, Soil and Environment, 2009, vol. 55, issue 8, 334-343

Abstract: 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 (search for similar items in EconPapers)
Date: 2009
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Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:55:y:2009:i:8:id:34-2009-pse

DOI: 10.17221/34/2009-PSE

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