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Transactions ID Number: 52-159
Full Name: Carlos Guerrero
Position: Assistant Professor
Age: ON
Sex: Male
Address: Universidade do Algarve, Faculdade de Ciências e Tecnologia, Edificio 8, Campus de Gambelas, 8005-139 FARO
Country: PORTUGAL
Tel: +351289800936
Tel prefix:
Fax: +351289818419
E-mail address: cguerre@ualg.pt
Other E-mails: jbeltrao@ualg.pt
Title of the Paper: The sludge and manure effects on the growth of citrus trees
Authors as they appear in the Paper: Manuel Costa, Jose Beltrao, Joao Brito, Maria Neves, Maribela Pestana and Carlos Guerrero
Email addresses of all the authors: mscosta2000@hotmail.com, jbeltrao@ualg.pt, jbrito@ualg.pt, maneves@ualg.pt, fpestana@ualg.pt, cguerre@ualg.pt
Number of paper pages: 10
Abstract: The objective of this study was to evaluate the agricultural use of organic solid wastes. Hence two types of organic solid wastes were selected to be applied in a citrus orchard: the sewage sludge (the most common on the settlements) and the manure (the most common on the agricultural fields). The sewage sludge is a residue originated from the wastewater treatment – the solid phase. Its application as an organic fertilizer may represent an alternative to the pollution effects in nature. In an orchard of orange-trees (Citrus sinensis [L.] Osbeck), the application of sludge was compared with the application of manure and with the control in order to observe the growth response of the trees. Biometric methods where used – number of leaves per tree, diameter of the trunk, leaf area, specific leaf areas and leaf chlorophyll content. In general, the citrus plants response to the application of sewage sludge and manure was (positive for the plant growth, compared to the c!
ontrol. The application of the manure, and especially the sewage sludge (once this fertilizer / soil amendment is available in larger amounts) may be a profitable alternative application to the use of mineral fertilizers and to other soil amendments. Moreover, as the possible destinations of sewage sludge (environment, deposition in land fields, incineration) provoke environmental problems, its agricultural reuse is essential to avoid those problems, when correctly applied in relation to trace elements and to pathogenic parameters. The reuse of this solid waste may be a clean and a safe technique to preserve the environment contamination, and may be used successfully as an organic amendment of citrus crops.
Keywords: citrus leaves, manure, plant development, sewage sludge, soil organic amendments
EXTENSION of the file: .pdf
Special (Invited) Session: ADVANCES in WASTE MANAGEMENT
Organizer of the Session: Ali Kallel, Abdelhamid Hassairi, Cornelia Aida Bulucea, Nikos Mastorakis
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