The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 27-632
Full Name: Manuel Costa
Position: Doctor (Researcher)
Age: ON
Sex: Male
Address: Rua Padre António Vieira, 24 - Loulé
Country: PORTUGAL
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E-mail address: mscosta2000@hotmail.com
Other E-mails: cguerre@ualg.pt; jbeltrao@ualg.pt
Title of the Paper: Effects of manure and sludge application on a citrus orchard
Authors as they appear in the Paper: Manuel Costa, José Beltrão, João Carrasco de Brito, Carlos Guerrero, Lídia Dionísio
Email addresses of all the authors: mscosta2000@hotmail.com, jbeltrao@ualg.pt, jbrito@ualg.pt, cguerre@ualg.pt, ldionis@ualg.pt
Number of paper pages: 10
Abstract: The urban sludge is a solid residue originated from wastewater treatment – its application as an organic fertilizer may decrease the pollution effects in nature, when compared to mineral fertilizers and other soil amendments. An orchard of orange-trees (Citrus sinensis [L.] Osbeck) was used to compare the effects of sludge and manure application. The chemical responses of the soil-plant-atmosphere system were observed. Hence, analysis of soil were performed in order to study the variation of soil salinity (ECs) and other parameters such as pH, organic matter OM, N, P2O5, K2O, Fe, Mn, Zn, Ca, Mg and Na. Trace elements (Cd, Ni, Pb and Cr) were also analyzed in the soil. In the citrus leaves, when sludge and manure were applied, N and Cl- parameters showed no significant variation, but an increase of Pb in the first year of the experiments was noticed. In the soil no significant chemical differences was observed, in relation to the different treatments, except the inc!
rease in salinity levels, when sludge and manure were applied. This effect was observed after the first experimental year, but not after the second year. Therefore no relevant disadvantages was found, at the end of the experiments, related to nutrients, salinity and trace elements, in the soil and in the citrus leaves, due to the application of urban sludge and manure. On the contrary, these residues represent a profitable alternative for the use of mineral fertilizers and other soil amendments. An overall and flexible legislation is an essential tool in order to integrate resources, users and environment.
Keywords: citrus leaves, nutrients, organic fertilizers, salinity, soil, soil amendments, trace elements
EXTENSION of the file: .pdf
Special (Invited) Session: Comparison between the effects of sludge and manure application on the soil of a citrus orchard
Organizer of the Session: 588-167 doc
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