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Hazenite: a new secondary phosphorus, potassium and magnesium fertiliser

Author

Listed:
  • Conor Watson

    (Life Sciences Faculty, Rhine-Waal University of Applied Sciences, Kleve, Germany)

  • Joachim Clemens

    (SF-Soepenberg GmbH, Huenxe, Germany)

  • Florian Wichern

    (Life Sciences Faculty, Rhine-Waal University of Applied Sciences, Kleve, Germany)

Abstract

Secondary fertilisers are becoming an important alternative to conventional mined fertilisers. For the first time, the struvite "relative" hazenite (KNaMg2(PO4)2∙14 H2O) has been artificially synthesised. A pot trial assessed whether hazenite-fertilised ryegrass had comparable potassium (K), magnesium (Mg), or phosphorus (P) uptake and shoot yields with treatments receiving conventional K (muriate of potash), Mg (kieserite) or P (triple superphosphate, TSP) fertilisers. Ryegrass shoot biomass production and K/Mg uptake in replicates receiving hazenite were as good as or superior to those amended with conventional fertilisers. Phosphorus uptake of plants whose P source was TSP was significantly higher than that of the hazenite-amended replicates without significantly higher shoot biomass, indicating luxury P uptake. Hazenite's constituent sodium (Na) makes it a potentially useful soil amendment for forage grasses or natrophilic crops such as sugar beet. Its component Mg would also be desirable in forage grasses to pre-empt ruminant hypomagnesemia or in crops with a relatively high Mg demand, for example, maize. Furthermore, hazenite represents a good alternative to KCl for chlorophobic crops such as potatoes. However, given its unusual ratio of Mg, P, and K, the ideal application of hazenite would probably be in combination with other fertilisers.

Suggested Citation

  • Conor Watson & Joachim Clemens & Florian Wichern, 2020. "Hazenite: a new secondary phosphorus, potassium and magnesium fertiliser," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 66(1), pages 1-6.
    • Handle: RePEc:caa:jnlpse:v:66:y:2020:i:1:id:492-2019-pse
    DOI: 10.17221/492/2019-PSE
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    References listed on IDEAS

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    1. Egle, Lukas & Rechberger, Helmut & Zessner, Matthias, 2015. "Overview and description of technologies for recovering phosphorus from municipal wastewater," Resources, Conservation & Recycling, Elsevier, vol. 105(PB), pages 325-346.
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