La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Plant uptake of phosphorus and nitrogen recycled from synthetic source-separated urine
Auteurs :	Christophe Bonvin, Auteur ; Bastian Etter, Auteur ; Kai M. Udert, Auteur ; Emmanuel Frossard, Auteur ; Simone Nanzer, Auteur ; Federica Tamburini, Auteur ; Astrid Oberson, Auteur
Type de document :	Article
Dans :	AMBIO (44 MAR 2015)
Article en page(s) :	S217-S227
Langues:	Anglais
Résumé :	Urine contains about 50 % of the phosphorus (P) and about 90 % of the nitrogen (N) excreted by humans and is therefore an interesting substrate for nutrient recovery. Source-separated urine can be used to precipitate struvite or, through a newly developed technology, nitrified urine fertilizer (NUF). In this study, we prepared P-33 radio-isotopeand stable N-15 isotope-labeled synthetic NUF (SNUF) and struvite using synthetic urine and determined P and N uptake by greenhouse-grown ryegrass (Lolium multiflorum var. Gemini) fertilized with these products. The P and N in the urine-based fertilizers were as readily plant-available in a slightly acidic soil as the P and N in reference mineral fertilizers. The ryegrass crop recovered 26 % of P applied with both urine-based fertilizers and 72 and 75 % of N applied as struvite and SNUF, respectively. Thus, NUF and urine-derived struvite are valuable N and P recycling fertilizers.

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