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Composted sewage sludge as an alternative substrate for forest seedlings production

Gabira Mônica Moreno, da Silva Richardson Barbosa Gomes, Bortolheiro Fernanda Pacheco de Almeida Prado, Mateus Caroline de Moura D’Andrea, Villas Boas Roberto Lyra, Rossi Sergio, Girona Miguel Montoro et da Silva Magali Ribeiro. (2021). Composted sewage sludge as an alternative substrate for forest seedlings production. iForest - Biogeosciences and Forestry, 14, (6), p. 569-575.

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URL officielle: http://dx.doi.org/doi:10.3832/ifor3929-014

Résumé

The production of forest seedlings with adequate morphological and physiological characteristics is essential for the success of plantations. Substrates and irrigation are the major factors determining seedlings’ growth. Substrates made of urban and agricultural residues are a sustainable alternative to peat-based substrates. In this study, we evaluated how composted sewage sludge substrates affect the growth and gas exchange in seedlings of Cedrela fissilis Vell. Seedlings were produced under daily irrigation depths of 6, 9, and 12 mm, and on different substrates. The substrates were based on sewage sludge composted with Eucalyptus bark or sugarcane bagasse, and a commercial substrate based on peat, involving a double factorial design with 12 treatments (3 irrigation depths × 3 substrates). Both physical and chemical characteristics of substrates were analyzed, and morphological traits and gas exchanges of seedlings were measured. Sewage sludge-based substrates presented different characteristics according to the material it was mixed. Eucalyptus bark provided higher bulk density (0.19 g cm-3) and lower total porosity (75%) to the substrate, while sugarcane bagasse increased macroporosity up to 60%. Seedlings produced in sewage sludge-based substrates presented a height up to 17.8 cm and stem diameters of between 8.39-10.29 mm. Higher shoot and root dry mass was obtained in sewage sludge-based substrates with irrigation depth of 9 mm, which were 3.71 and 2.01 g, respectively. Photosynthetic carbon assimilation varied between 2.26 and 3.23 µmol CO2 m-2 s-1, and water use efficiency varied from 2.058 to 3.395 µmol CO2 (mol H2O)-1, with the highest values being obtained in seedlings produced in sewage sludge-based substrates with irrigation depth of 6 mm. Our results demonstrate that sewage sludge-based substrates are an efficient alternative to commercial peat-based substrates for seedling production.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:19717458
Volume:14
Numéro:6
Pages:p. 569-575
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.3832/ifor3929-014
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Départements et modules > Département des sciences fondamentales
Mots-clés:agricultural residues, Cedrela fissilis, forest nursery, gas exchange, irrigation, plant growth, silviculture, solid wastes
Déposé le:05 juin 2023 15:10
Dernière modification:05 juin 2023 15:10
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