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Article

Greenhouse Assays with Lactuca sativa for Testing Sewage Sludge-Based Soil Amendments

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CIEPQPF, Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II–Pinhal de Marrocos, 3030-790 Coimbra, Portugal
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BioSmart–Soluções Ambientais S.A., Rua de Tomar, 2495-185 Leiria, Portugal
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HRV–Equipamentos de Processo, S.A., Rua da Finlândia, Lt. 46, Zona Industrial da Marinha Grande, Marinha Grande, 2430-028 Leiria, Portugal
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Department of Mechanical Engineering, University of Coimbra, Association for the Development of Industrial Aerodynamics, Rua Sílvio Lima, Pólo II–Pinhal de Marrocos, 3030-790 Coimbra, Portugal
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Author to whom correspondence should be addressed.
Academic Editor: Arno Rosemarin
Agronomy 2022, 12(1), 209; https://doi.org/10.3390/agronomy12010209
Received: 6 December 2021 / Revised: 8 January 2022 / Accepted: 12 January 2022 / Published: 15 January 2022
Sustainable agriculture practices within the guidelines of nutrient recycling and the circular economy must be increasingly promoted. This work aims to evaluate the performance of dried sewage sludge (DSS), green liquor dregs mixed with sewage sludge (DSSA), raw sewage sludge, and commercial organic fertilizer control, using a short-term agronomic assessment with lettuce crop (Lactuca sativa) in greenhouse conditions. Different application rates based on the nitrogen content were tested for each soil amendment: 0, 85, 170, and 225 kg N/ha (treatments T0, T1, T2, and T3, respectively). DSS and DSSA resulted in fresh lettuce productivities 1.3 and 3.2 times higher in T3 than in T0, respectively. The ideal N content in lettuce leaves was reached for all materials and treatments, with the highest values obtained for DSS (2.88–3.33% from T1 to T3). Lettuce produced in soils amended with DSS and DSSA showed also ideal levels of Ca. Overall, the performance of sludge-based products was similar to commercial fertilizer, without impairing the nutritional balance of the crop and the soil. View Full-Text
Keywords: biosolids; lettuce; soil productivity; pulp mill dregs; heavy metals; residues biosolids; lettuce; soil productivity; pulp mill dregs; heavy metals; residues
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MDPI and ACS Style

Santos, A.F.; Veríssimo, A.M.; Brites, P.; Baptista, F.M.; Góis, J.C.; Quina, M.J. Greenhouse Assays with Lactuca sativa for Testing Sewage Sludge-Based Soil Amendments. Agronomy 2022, 12, 209. https://doi.org/10.3390/agronomy12010209

AMA Style

Santos AF, Veríssimo AM, Brites P, Baptista FM, Góis JC, Quina MJ. Greenhouse Assays with Lactuca sativa for Testing Sewage Sludge-Based Soil Amendments. Agronomy. 2022; 12(1):209. https://doi.org/10.3390/agronomy12010209

Chicago/Turabian Style

Santos, Andreia F., Ana M. Veríssimo, Pedro Brites, Filipe M. Baptista, José C. Góis, and Margarida J. Quina. 2022. "Greenhouse Assays with Lactuca sativa for Testing Sewage Sludge-Based Soil Amendments" Agronomy 12, no. 1: 209. https://doi.org/10.3390/agronomy12010209

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