{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T03:07:55Z","timestamp":1774321675111,"version":"3.50.1"},"reference-count":74,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2022,8,13]],"date-time":"2022-08-13T00:00:00Z","timestamp":1660348800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Programa Operacional Madeira 14\u201320, Portugal 2020","award":["grant number M1420-01-0145-FEDER-000011 [CASBio]"],"award-info":[{"award-number":["grant number M1420-01-0145-FEDER-000011 [CASBio]"]}]},{"name":"Programa Operacional Madeira 14\u201320, Portugal 2020","award":["grant number M1420-09-5369-FSE000002, ARDITI"],"award-info":[{"award-number":["grant number M1420-09-5369-FSE000002, ARDITI"]}]},{"name":"European Union through the European Regional Development Fund","award":["grant number M1420-01-0145-FEDER-000011 [CASBio]"],"award-info":[{"award-number":["grant number M1420-01-0145-FEDER-000011 [CASBio]"]}]},{"name":"European Union through the European Regional Development Fund","award":["grant number M1420-09-5369-FSE000002, ARDITI"],"award-info":[{"award-number":["grant number M1420-09-5369-FSE000002, ARDITI"]}]},{"name":"the Ag\u00eancia Regional para o Desenvolvimento da Investiga\u00e7\u00e3o, Tecnologia e Inova\u00e7\u00e3o, Portugal 2020 and the European Union through the European Social Fund","award":["grant number M1420-01-0145-FEDER-000011 [CASBio]"],"award-info":[{"award-number":["grant number M1420-01-0145-FEDER-000011 [CASBio]"]}]},{"name":"the Ag\u00eancia Regional para o Desenvolvimento da Investiga\u00e7\u00e3o, Tecnologia e Inova\u00e7\u00e3o, Portugal 2020 and the European Union through the European Social Fund","award":["grant number M1420-09-5369-FSE000002, ARDITI"],"award-info":[{"award-number":["grant number M1420-09-5369-FSE000002, ARDITI"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Agronomy"],"abstract":"<jats:p>Sewage sludge (SS) is derived from wastewater treatment plants and can be used as a biofertilizer when properly stabilized. This work aimed to evaluate SS application for agricultural production improvement. SS was tested on Porto Santo Island (Portugal). The experiment was randomly designed with three 25 m2 plots for each treatment (2 SS concentrations + control without SS) and performed in two consecutive cycles. For the first cycle, dehydrated sludge was mixed with soil, obtaining final concentrations of 0.8 kg\/m2 (C1) and 1.6 kg\/m2 (C2). Half of the concentration was used for the second cycle. Fifty-eight sweet potato plants were used in each plot. SS application boosted the agronomic parameters of biomass, productivity, and shoot biomass. Furthermore, improvements in soil properties were observed, mainly for pH, CEC, and NO3-N, with no significant increase in heavy metals. For the edible parts, heavy metal concentrations decreased, and Pb was the only one that still exceeded the maximum limits. The results demonstrated that SS application to low-fertility soil is effective in improving the agronomic parameters of sweet potato and enhancing soil features. Further studies considering other variables, i.e., SS origin, soil properties, and the crop, must be carried out to propose custom applications.<\/jats:p>","DOI":"10.3390\/agronomy12081902","type":"journal-article","created":{"date-parts":[[2022,8,14]],"date-time":"2022-08-14T21:09:06Z","timestamp":1660511346000},"page":"1902","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Sewage Sludge Fertilization\u2014A Case Study of Sweet Potato Yield and Heavy Metal Accumulation"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1822-5473","authenticated-orcid":false,"given":"Carla","family":"Ragonezi","sequence":"first","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"},{"name":"Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Tr\u00e1s-os-Montes and Alto Douro, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6166-8045","authenticated-orcid":false,"given":"Nuno","family":"Nunes","sequence":"additional","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"},{"name":"Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Tr\u00e1s-os-Montes and Alto Douro, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3859-6412","authenticated-orcid":false,"given":"Maria Cristina O.","family":"Oliveira","sequence":"additional","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"}]},{"given":"Jos\u00e9 G. R.","family":"de Freitas","sequence":"additional","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"}]},{"given":"Jos\u00e9 Filipe T.","family":"Ganan\u00e7a","sequence":"additional","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5084-870X","authenticated-orcid":false,"given":"Miguel \u00c2. A. Pinheiro","family":"de Carvalho","sequence":"additional","affiliation":[{"name":"ISOPlexis Centre Sustainable Agriculture and Food Technology, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"},{"name":"Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), University of Tr\u00e1s-os-Montes and Alto Douro, 5000-801 Vila Real, Portugal"},{"name":"Faculty of Life Sciences, Campus da Penteada, University of Madeira, 9020-105 Funchal, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1016\/j.scienta.2019.02.004","article-title":"Biosolids application improves mineral composition and phenolic profile of basil cultivated on eroded soil","volume":"249","author":"Burducea","year":"2019","journal-title":"Sci. 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