Plant Soil Environ., 2019, 65(5):225-232 | DOI: 10.17221/109/2019-PSE

Balance of potassium in two long-term field experiments with different fertilization treatmentsOriginal Paper

Jiří Balík*, Jindřich Černý, Martin Kulhánek, Ondřej Sedlář, Pavel Suran
Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic

Balance of potassium (K) was observed in long-term stationary field experiments (21 years) at two sites with different soil and climatic conditions (Luvisol, Cambisol). The following crops were rotated within the trial: potatoes- winter wheat-spring barley. All three crops were grown each year. The trial comprised 6 treatments: (1) no fertilization; (2) farmyard manure; (3) half dose of farmyard manure + nitrogen (N) in mineral nitrogen fertilizers; (4) mineral nitrogen fertilizers; (5) NPK in mineral fertilizers; (6) straw of spring barley + N in mineral nitrogen fertilizers. The recovery rate of potassium from farmyard manure by crops was 24-26%, from mineral fertilizers it was 27-52%. Different fertilization intensities were manifested by significant differences in the content of exchangeable K in soil. Changes in non-exchangeable K (Kne) were recorded only at the Luvisol site (850 mg Kne/kg), but not at the Cambisol site (3000 mg Kne/kg). The maximum negative balance (-2376 kg K/ha/21 years) was recorded at the mineral nitrogen fertilization treatment.

Keywords: farmyard manure; mineral fertilizers; potatoes; wheat, barley; bioavailable K; non-exchangeable K

Published: May 31, 2019  Show citation

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Balík J, Černý J, Kulhánek M, Sedlář O, Suran P. Balance of potassium in two long-term field experiments with different fertilization treatments. Plant Soil Environ.. 2019;65(5):225-232. doi: 10.17221/109/2019-PSE.
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