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- W2172243484 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 increase 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." @default.
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- W2172243484 date "2008-01-01" @default.
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- W2172243484 title "Effects of manure and sludge application on a citrus orchard" @default.
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