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Physico-chemical Characteristics and Nitrogen Use Efficiency of Nine Human Urine-Based Fertilizers in Greenhouse Conditions

Abstract

Most of the nutrients in wastewater come from human urine and their recycling for agricultural purposes is very limited. After source separation, urine can be treated to produce various urine-based fertilizers. This study aims to characterize the nitrogen use efficiency of different urine-based fertilizers. Nine urine-based fertilizers were compared together with ammonium nitrate and cattle slurry in a greenhouse pot trial with English rye-grass, (Lolium perenne L.). The detailed physico-chemical characteristics of the fertilizers were analyzed. The biomass production and nitrogen uptake of the plants were measured. The nitrogen use efficiency and the mineral fertilizer equivalent were determined for each fertilizer. The urine-based fertilizers were classified in four types based on their nitrogen forms (ammonia, nitrate, urea, or organic). The mineral fertilizer equivalent of most urine-based fertilizers were above 85% and even higher than 100% for nitrified concentrated and acidified stored urine. The lowest mineral fertilizer equivalent were found for fermented fresh urine and the mixture of fresh urine and woodchips but remained between 65 and 75%. In all cases, the nitrogen use efficiencies of urine-based fertilizers were higher than that of cattle slurry. The differences among the urine-based fertilizers and from the cattle slurry were attributed to the mineral nitrogen content which was much higher in urine-based fertilizers. Indeed, they contain mainly mineral nitrogen. Their content of trace element contaminants is low. Their efficiency as nitrogen fertilizers is high and close to that of mineral fertilizer. However, new valorization pathways from cities to agriculture need to be developed.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This study is part of the AGROCAPI project (www.leesu.fr/ocapi). We also wanted to thank Pascal Denoroy to allow us to use the soil from the Folleville long-term trial. We would like to thank the Swedish University of Agricultural Sciences and TOOPI Organics for the urine-based fertilizer samples.

Funding

This work was supported by ADEME (Agence de l’environnement et de la maîtrise de l’énergie); SEDE Environnement; SIAAP (Syndicat interdépartemental pour l’assainissement de l’agglomération parisienne); and « IDI 2017» project funded by the IDEX Paris-Saclay, ANR-11-ISEX-0003–02.

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Tristan Martin, Florent Levavasseur, Kris Dox, Fabien Esculier, Erik Smolders, and Sabine Houot contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Tristan Martin, Kris Dox, and Léa Tordera with the help of the other authors. The first draft of the manuscript was written by Tristan Martin and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Tristan M. P. Martin.

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Martin, T.M.P., Levavasseur, F., Dox, K. et al. Physico-chemical Characteristics and Nitrogen Use Efficiency of Nine Human Urine-Based Fertilizers in Greenhouse Conditions. J Soil Sci Plant Nutr 21, 2847–2856 (2021). https://doi.org/10.1007/s42729-021-00571-4

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  • DOI: https://doi.org/10.1007/s42729-021-00571-4

Keywords

  • Fertilization
  • Greenhouse trial
  • Human urine
  • Nutrient recycling
  • Source separation
  • Urine-based fertilizer