{"id":1109,"date":"2021-05-26T17:41:49","date_gmt":"2021-05-26T15:41:49","guid":{"rendered":"https:\/\/urbag.eu\/?p=1109"},"modified":"2021-05-26T17:41:49","modified_gmt":"2021-05-26T15:41:49","slug":"publication-in-frontiers-in-plant-science-2","status":"publish","type":"post","link":"https:\/\/webs.uab.cat\/atmosphere\/2021\/05\/26\/publication-in-frontiers-in-plant-science-2\/","title":{"rendered":"Publication in Frontiers in Plant Science"},"content":{"rendered":"

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See full article\/ Veure l’article complet: https:\/\/doi.org\/10.3389\/fpls.2021.649304<\/a><\/strong><\/p>\n

English:<\/strong><\/p>\n

Soilless crop production is a viable way to promote vertical agriculture in urban areas, but it relies extensively on the use of mineral fertilizer. Thus, the benefits of fresher, local food and avoiding the transportation and packaging associated with food import could be counteracted by an increase in nutrient-rich wastewater, which could contribute to freshwater and marine eutrophication. The present study aimed to explore the use of mineral fertilizer substitutes in soilless agriculture.\u00a0Phaseolus vulgaris<\/i>\u00a0(common bean) was fertilized with a combination of slow-releasing fertilizer struvite (a source of N, P, and Mg), which is a byproduct of wastewater treatment plants, and inoculation with Rhizobium (a N2<\/sub>-fixing soil bacteria). The experiment included three bean-production lines: (A) 2 g\/plant of struvite and rhizobial inoculation; (B) 5 g\/plant of struvite and rhizobial inoculation, both irrigated with a Mg-, P-, and N-free nutrient solution; and (C) a control treatment that consisted of irrigation with a full nutrient solution and no inoculation. Plant growth, development, yields, and nutrient contents were determined at 35, 62, and 84 days after transplanting as well as biological N2<\/sub>\u00a0fixation, which was determined using the\u00a015<\/sup>N natural abundance method. Treatments A and B resulted in lower total yields per plant than the control C treatment (e.g., 59.35 \u00b1 26.4 g plant\u20131<\/sup>\u00a0for A, 74.2 \u00b1 23.0 g plant\u20131<\/sup>\u00a0for B, and 147.71 \u00b1 45.3 g plant\u20131<\/sup>\u00a0for C). For A and B, the nodulation and N2<\/sub>\u00a0fixation capacities appeared to increase with the amount of initially available struvite, but, over time, deficient levels of Mg were reached as well as nearly deficient levels of P, which could explain the lower yields. Nevertheless, we conclude that the combination of struvite and N2<\/sub>-fixing bacteria covered the N needs of plants throughout the growth cycle. However, further studies are needed to determine the optimal struvite quantities for vertical agriculture systems that can meet the P and Mg requirements throughout the lifetime of the plants.<\/p>\n

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Catal\u00e0:<\/strong><\/p>\n

La producci\u00f3 de cultius sense terra \u00e9s una manera viable de promoure l’agricultura vertical a les zones urbanes, per\u00f2 es basa \u00e0mpliament en l’\u00fas d’adobs minerals. Aix\u00ed doncs, els beneficis de consumir els aliments m\u00e9s frescos i locals i evitar el transport i l’embalatge associats a la importaci\u00f3 d’aliments, es podrien contrarestar amb un augment de les aig\u00fces residuals riques en nutrients, que podrien contribuir a l’eutrofitzaci\u00f3 marina i d\u2019aigua dol\u00e7a. El present estudi tenia com a objectiu explorar l’\u00fas de substituts dels fertilitzants minerals en l’agricultura sense terra. La\u00a0Phaseolus vulgaris<\/em>\u00a0 (mongeta comuna) es va fertilitzar amb una combinaci\u00f3 del fertilitzant alliberador lent struvite (una font de N, P i Mg), que \u00e9s un subproducte de les estacions depuradores d’aig\u00fces residuals, i la inoculaci\u00f3 amb Rhizobium (unbacteri del s\u00f2l fixador N2<\/sub>-). L’experiment inclou tres l\u00ednies de producci\u00f3 de fesols: (A) 2 g\/planta d’inoculaci\u00f3 struvita i rizobial; (B) 5 g\/planta d’inoculaci\u00f3 struvita i rizobial, tots dos regats amb una soluci\u00f3 de nutrients sense Mg-, P- ni N-; i (C) un tractament de control que consistia en regar amb una soluci\u00f3 completa de nutrients i sense inoculaci\u00f3. El creixement de les plantes, el desenvolupament, els rendiments i els continguts de nutrients es van determinar a 35, 62 i 84 dies despr\u00e9s del trasplantament, aix\u00ed com la fixaci\u00f3 biol\u00f2gica N2,<\/sub> que es va determinar utilitzant el m\u00e8tode d’abund\u00e0ncia natural de 15<\/sup>N. Els tractaments A i B van donar com a resultat rendiments totals m\u00e9s baixos per planta que el tractament de control C (per exemple, 59,35 \u00b1 26,4 g planta\u20131<\/sup> \u00a0per A, 74,2 \u00b1 23,0 g planta\u20131<\/sup> \u00a0\u00a0per a B, i 147,71 \u00b1 45,3 g planta\u20131 <\/sup>per a C). Per a A i B, les capacitats de nodulaci\u00f3 i fixaci\u00f3 de N2<\/sub>\u00a0 semblaven augmentar amb la quantitat de struvita inicialment disponible, per\u00f2, amb el temps, es van assolir nivells deficients de Mg, aix\u00ed com nivells gaireb\u00e9 deficients de P, la qual cosa podria explicar els menors rendiments. No obstant aix\u00f2, concloem que la combinaci\u00f3 de struvite <\/em>i la fixaci\u00f3 de N2<\/sub>– bacterial cobreix les necessitats de N de les plantes al llarg del cicle de creixement. D\u2019altra banda, es necessiten m\u00e9s estudis per determinar les quantitats \u00f2ptimes de struvite<\/em> per als sistemes d’agricultura vertical que poden satisfer els requisits de P i Mg al llarg de la vida de les plantes.<\/p>\n

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Figure:<\/strong> Graphic representation of the mean numerical count per plant for each organ (Leaves, flower buttons, open flowers) and yield in g\/plant on a weekly basis, DAT representing the days after transplanting inside the iRTG. The colors represent the three treatments: A = N.free solution with Rhizobium inoculation and 2g of struvite per plant. B = N.free solution with Rhizobium inoculation and 5g of struvite per plant. C = Complete nutrient solution without struvite and no inoculation treatment.<\/p>\n

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

Soilless crop production is a viable way to promote vertical agriculture in urban areas, but it relies extensively on the use of mineral fertilizer. The benefits of fresher, local food and avoiding the transportation and packaging associated with food import could be counteracted by an increase in nutrient-rich wastewater, which could contribute to freshwater and marine eutrophication.<\/p>\n","protected":false},"author":3153,"featured_media":1130,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1109","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=1109"}],"version-history":[{"count":0,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1109\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media\/1130"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media?parent=1109"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/categories?post=1109"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/tags?post=1109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}