Skip to main content

Advertisement

Log in

Water soluble phosphate fertilizers for crops grown in calcareous soils – an outdated paradigm for recycled phosphorus fertilizers?

  • Regular Article
  • Published:
Plant and Soil Aims and scope Submit manuscript

Abstract

Background and aims

The current paradigm for phosphorus (P) fertilizers applied to calcareous soil is that almost entirely water soluble P fertilizers are efficient and sparingly soluble P fertilizers are not efficient P sources for crops. We hypothesize that this paradigm does not apply to recycled P fertilizers and that other P pools can explain the plant use of recycled P fertilizers on calcareous soil.

Methods

We applied 33P isotopic dilution method to evaluate recycled P fertilizers based on plant P uptake from fertilizer relative to plant uptake from a water soluble P reference fertilizer. The predictability of fertilizer effectiveness based on sequentially extracted P forms and X-ray diffraction pattern of recycled fertilizers derived from sewage sludge, human urine and organic waste was evaluated.

Results

The plant experiments showed that tested recycled P fertilizers including compost were more effective than rock phosphate. The water insoluble P contained in urine based products was almost as effective as a fully water soluble P fertilizer. The tested recycled P fertilizers are characterized by complex P compounds differing in solubility which were so far not considered in the water and citric acid extraction methods. The fraction of resin- and NaHCO3 extractable fertilizer P explained effectiveness of P fertilizer applied to the calcareous and to an acidic soil.

Conclusion

We concluded that water solubility is not required when P forms in recycled products are comparable to reactions products of rock phosphate based fertilizers in soil. Alternatives to fully water soluble P fertilizers are available to supply P to crops grown on calcareous soil efficiently.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1: Sources of P in shoots of ryegrass
Fig. 2: Recovered fertilizer P in shoots in percentage of applied P via fertilizer
Fig. 3: Fertilizer effectiveness
Fig. 4: Sequential fractions of fertilizer P
Fig. 5: Relative P fertilizer effectiveness and extractable fertilizer P

Similar content being viewed by others

Abbreviations

AC:

Acidic soil

AL:

Calcareous soil

CSHP:

Calcium silicate hydrate phosphate

DAMP:

Di-ammonium phosphate

DCP:

Di-calcium phosphate

MAP:

Mono-ammonium phosphate

MCP:

Mono-calcium phosphate

OWDd:

Organic waste based solid digestate, dried

OWDdc:

Organic waste based solid digestate, composted

Pdf:

Phosphorus derived from

RP:

Rock phosphate

SSA:

Sewage sludge ash

STRU:

Struvite

UCfN:

Urine calcium full nutrient

UCP:

Urine calcium phosphate

WSP:

Water soluble P

XRD:

X-ray diffraction

References

Download references

Acknowledgements

We acknowledge the help of Brian Sinnet from Eawag with XRD analysis and Laurie Mauclaire-Schönholzer, Iris Huber and Eric Vogelsanger for their help with analyses and the plant growth experiments. We thank Jacques Fuchs from FiBL Switzerland for having provided the contact to the biogas plant in Pratteln, Switzerland. We also thank Wolfgang Ewert and Andreas Lengemann from Berliner Wasserbetriebe Wassmannsdorf, Germany, and Anke Ehbrecht from the Karlsruher Institute of Technology (KIT) for providing their recycled P products. Finally, we acknowledge the financial support of the CORE Organic II Funding Bodies, being partners of the FP7 ERA-Net project, CORE Organic II (Coordination of European Transnational Research in Organic Food and Farming systems, project no. 249667). We also thank N.J. Barrow and the three anonymous reviewers for their constructive comments.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to G. Meyer.

Additional information

Responsible Editor: N. Jim Barrow

Electronic supplementary material

ESM 1

(DOCX 297 kb)

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Meyer, G., Frossard, E., Mäder, P. et al. Water soluble phosphate fertilizers for crops grown in calcareous soils – an outdated paradigm for recycled phosphorus fertilizers?. Plant Soil 424, 367–388 (2018). https://doi.org/10.1007/s11104-017-3545-x

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11104-017-3545-x

Keywords

Navigation