{"id":953,"date":"2021-02-02T14:06:57","date_gmt":"2021-02-02T12:06:57","guid":{"rendered":"https:\/\/urbag.eu\/?p=953"},"modified":"2021-02-02T14:06:57","modified_gmt":"2021-02-02T12:06:57","slug":"publication-in-science-of-the-total-environment","status":"publish","type":"post","link":"https:\/\/webs.uab.cat\/atmosphere\/2021\/02\/02\/publication-in-science-of-the-total-environment\/","title":{"rendered":"Publication in Science of the Total Environment"},"content":{"rendered":"

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See full article\/Veure l’article complet: https:\/\/doi.org\/10.1016\/j.scitotenv.2020.144744<\/a><\/p>\n

English:<\/p>\n

Urban agriculture, while being a promising solution to increase food sovereignty in cities, can lead to an unprecedented discharge of nutrient and fertilizer-related emissions into the urban environment. Especially relevant are nitrogen (N) and phosphorus (P), due to their contribution to marine and freshwater eutrophication. Therefore, alternative methods of fertilization need to be put into practice to avoid such impacts to the surrounding environment. Struvite, has been studied as a potential slow releasing fertilizer due to its high P content, while the bacteria rhizobium has been used to fix N directly from the atmosphere. Legumes, like the common bean are N-demanding crops capable of symbiosis with the bacteria rhizobium and have previously shown positive responses to fertilization with struvite. This study aims to analyze the environmental performance of plant production in hydroponic systems combining rhizobium inoculation and struvite (2\u00a0g, 5\u00a0g, 10\u00a0g, 20\u00a0g) irrigated with a N and P deficient nutrient solution, using life cycle analysis (LCA). The nutrient content of in- and out-going irrigation was analyzed as well as in plants and beans. The functional unit for the LCA was 1\u00a0kg of fresh beans. The results obtained indicate a yield reduction of 60% to 50% in comparison to the control which was irrigated with a full nutrient solution. The impacts from operational stage are less in all impact categories, where most significant reductions up to 69% and 59% are seen in marine-eutrophication and global warming respectively. Although the infrastructure does not change between treatments, its impacts increase due to the lower yields. We determine that below a 10% of the control yield, the alternative systems have more impact than the use of conventional mineral fertilizers in almost all impact categories, thus pointing to the importance of infrastructure to truly reduce environmental impacts for urban agriculture.<\/p>\n

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Catal\u00e0:<\/p>\n

L’agricultura urbana, tot i ser una soluci\u00f3 prometedora per augmentar la sobirania aliment\u00e0ria a les ciutats, pot conduir a una desc\u00e0rrega sense precedents d’emissions relacionades amb l’\u00fas de nutrients i fertilitzants en l’entorn urb\u00e0. A causa de la seva contribuci\u00f3 a l’eutrofitzaci\u00f3 marina i d’aigua dol\u00e7a, s\u00f3n especialment rellevants el nitrogen (N) i el f\u00f2sfor (P). Per tant, s’han de posar en pr\u00e0ctica m\u00e8todes alternatius de fertilitzaci\u00f3 per evitar aquests impactes en l’entorn circumdant. S’ha estudiat l’Struvite com un possible fertilitzant d’alliberament lent a causa del seu alt contingut en P, mentre que el bacteri rhizobium s’ha utilitzat per fixar N directament de l’atmosfera. Els llegums, com la mongeta comuna, s\u00f3n cultius exigents en N per\u00f2 capa\u00e7os de la simbiosi amb el bacteri rizobi i pr\u00e8viament han mostrat respostes positives a la fertilitzaci\u00f3 amb struvite. Aquest estudi t\u00e9 com a objectiu analitzar el rendiment ambiental de la producci\u00f3 de plantes en sistemes hidrop\u00f2nics, combinant inoculaci\u00f3 i struvite de rizobi (2 g, 5 g, 10 g, 20 g) regats amb una soluci\u00f3 nutritiva deficient en N i P, mitjan\u00e7ant an\u00e0lisi del cicle de vida (LCA). S’ha analitzat el contingut nutritiu del reg entrant i sortint en mongetes. La unitat funcional de la LCA era d’1 kg de mongetes fresques. Els resultats obtinguts indiquen una reducci\u00f3 de rendiment del 60% al 50% en comparaci\u00f3 amb el cas de control, el qual es va regar amb una soluci\u00f3 completa nutricionalment. Els impactes de l’etapa operativa s\u00f3n menors en totes les categories, on les reduccions m\u00e9s significatives que arriben fins al 69% i el 59% es veuen en l’eutrofitzaci\u00f3 marina i l’escalfament global, respectivament. Tot i que la infraestructura no canvia entre tractaments, els seus impactes augmenten a causa dels menors rendiments. Hem determinat que si baixem per sota d’un 10% del rendiment en comparaci\u00f3 al cas de control, els sistemes alternatius tenen m\u00e9s impacte que l’\u00fas de fertilitzants minerals convencionals en gaireb\u00e9 totes les categories d’impacte, apuntant aix\u00ed a la import\u00e0ncia de les infraestructures per reduir veritablement els impactes ambientals per a l’agricultura urbana.<\/p>\n

 <\/p>\n

\"\"Graphical abstract
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 <\/p>\n","protected":false},"excerpt":{"rendered":"

Urban agriculture, while being a promising solution to increase food sovereignty in cities, can lead to an unprecedented discharge of nutrient and fertilizer-related emissions into the urban environment. Especially relevant are nitrogen (N) and phosphorus (P), due to their contribution to marine and freshwater eutrophication.<\/p>\n","protected":false},"author":3153,"featured_media":963,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[30,31,32,33,34,35,36,15],"class_list":["post-953","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-agricultura","tag-agricultura-urbana","tag-agriculture","tag-emissions","tag-environment","tag-fertigation","tag-science","tag-urban-agriculture"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/users\/3153"}],"replies":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/comments?post=953"}],"version-history":[{"count":0,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/953\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media\/963"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media?parent=953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/categories?post=953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/tags?post=953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}