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Potassium fractions in soil and simple K balance in long-term fertilising experiments

Author

Listed:
  • Jiří Balík
  • Martin Kulhánek

    (Department of Agro-Environmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Jindřich Černý

    (Department of Agro-Environmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Ondřej Sedlář

    (Department of Agro-Environmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Pavel Suran

    (Department of Agro-Environmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

Experiments were used to determine the potassium release from the non-exchangeable K (Kne) forms that are involved in plant nutrition and which replenish the pool of available K. Long-term stationary field experiments with different fertilisation systems (organic: farmyard manure, sewage sludge, straw; mineral: NPK, N) were carried out to study the potassium balance and the K content changes in the topsoil (0-30 cm) and subsoil (30-60 cm). The trials were located at three sites with different soil-climatic conditions. The following crops were rotated within the trial: potatoes (maize) - winter wheat - spring barley. All three crops were grown each year over 21 years. Positive correlations between the contents of the available K in the topsoil and the potassium balance (K inputs - K outputs) were observed. There were no statistically significant differences among the treatments. Depending on the soil properties, the ratio of non-exchangeable K (Kne) was 12-37% of the values obtained via the aqua regia extraction. Depending on the site, the amount released from the Kne forms to the available K form was 46-69 kg K/ha/ year. The use of K from the farmyard manure varied from 7.4% up to 25%. Due to the low K content in the sewage sludge, the long-term fertilisation with sludge may only lead to the depletion of the available K in the soil, similar to the sole N mineral fertilisation.

Suggested Citation

  • Jiří Balík & Martin Kulhánek & Jindřich Černý & Ondřej Sedlář & Pavel Suran, 2020. "Potassium fractions in soil and simple K balance in long-term fertilising experiments," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 15(4), pages 211-219.
    • Handle: RePEc:caa:jnlswr:v:15:y:2020:i:4:id:151-2019-swr
    DOI: 10.17221/151/2019-SWR
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    References listed on IDEAS

    as
    1. J. Černý & J. Balík & M. Kulhánek & K. Čásová & V. Nedvěd, 2010. "Mineral and organic fertilization efficiency in long-term stationary experiments," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 56(1), pages 28-36.
    2. Jiří Balík & Jindřich Černý & Martin Kulhánek & Ondřej Sedlář & Pavel Suran, 2019. "Balance of potassium in two long-term field experiments with different fertilization treatments," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(5), pages 225-232.
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