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Research Journal of Environmental Sciences
Year: 2008  |  Volume: 2  |  Issue: 4  |  Page No.: 281 - 290

Growth and Mineral Accumulation in Olea europaea L. Trees Irrigated with Municipal Effluent

A. Aghabarati, S.M. Hosseini, A. Esmaili and H. Maralian    

Abstract: Effect of municipal effluent on survival, growth and mineral nutrient in Olea europaea L. trees were studied. A study was carried out at Tehran (Iran) in which olive trees were irrigated with municipal effluent and well water for a period of 7 years. We analyzed the soil; leaves and fruits of olive trees irrigated with municipal effluent and compared them with olive trees irrigated with well water. Observation included tree height, collar diameter, survival and plant mineral composition, mineral uptake and change in soil properties at 7 years of plant age. Application of municipal effluent produced better growth in Olea europaea L. trees. The trees irrigated with municipal effluent attained 3.26±0.07 m height, 13.35±0.41 cm collar diameter, but trees irrigated with well water attained 2.47±0.12 m height, 9.5±0.64 cm collar diameter at the age of 7 years. Irrigation with municipal effluent increases pH, EC, OM, NH4-N, NO3-N and PO4-P in soil. Concentration of N, P, K, Ca and Mg were greater in leaves and fruits of trees irrigated with municipal effluent than those of the leaves of trees irrigated with well water. Municipal effluent may be useful in tree irrigation to increase biomass productivity. Further, reduction of toxic concentration of metal ions in effluents may be helpful for a long-term field application.

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