Phosphorus uptake from struvite is modulated by the nitrogen form applied

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet

Authors

  • Ana A. Robles-Aguilar
  • Silvia D. Schrey
  • Johannes A. Postma
  • Vicky M. Temperton
  • Nicolai D. Jablonowski

Next to nitrogen, phosphorus (P) is the most limiting nutrient for plant production worldwide. To secure food production, new nutrient management strategies using alternative P sources instead of mined P fertilizers need to be implemented. Struvite (MgNH4PO4 · 6 H2O) is a promising example of a recycled mineral P fertilizer. Besides positive agronomic results regarding crop yields, further investigations are required to improve the use efficiency of the product and thereby increase its value. Using an automated plant phenotyping platform, we investigated the dynamic response to struvite by two plant species (lupine and maize) with diverse P acquisition strategies in an acidic sandy substrate. Although at three weeks after germination both maize and lupine had reduced leaf area in the struvite treatments compared to the commercial triple superphosphate (TSP), from week four onwards struvite plants grew larger than the TSP-treated plants, indicating a slow release fertilizing effect. Greater P uptake efficiency (g / root length), but reduced root length were observed in the combined treatment of struvite and ammonium, in comparison to struvite and nitrate. We propose that rhizosphere acidification in response to ammonium uptake may enhance P recovery from struvite. A possible additional acidification effect by lupine root exudation might explain the higher P uptake efficiency in this species compared to maize. We conclude that struvite combined with ammonium can be used as a sustainable slow-release P fertilizer on acidic sandy soils.

OriginalspracheEnglisch
ZeitschriftJournal of Plant Nutrition and Soil Science
Jahrgang183
Ausgabenummer1
Seiten (von - bis)80-90
Anzahl der Seiten11
ISSN1436-8730
DOIs
PublikationsstatusErschienen - 01.02.2020

Bibliographische Notiz

The work was conducted within the ManureEcoMine project, funded by the European Community's Framework Programme ( FP7 /2007–2013 ) under Grant Agreement n° 603744 . We would like to thank Thomas Bodewein for expert advice and assistance with measurements and trial management and Christoph Briese for helping with the image analyzes. The authors are grateful to Lucy Harrison for the technical support and colleagues from ZEA‐3 (Forschungszentrum Jülich GmbH) for the chemical analysis of the plant, fertilizer and substrate samples. We thank cordially Jose Correa for his help in the statistical analysis. We highly acknowledge the financial support of numerous students by the DAAD and IAESTE program, providing great support for this experiment. Many thanks to Dr. Jiayin Pang , The University of Western Australia, for her valuable comments on the first draft of this manuscript.

DOI

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