Nutrition Properties of Soil and Leaf of Eldar Pine Trees Irrigated by Municipal Effluent
Subject Areas : environmental managementAzadeh Salehi 1 , Masoud Tabari Kochksaraei 2 *
1 - Ph.D. Student in Forestry, Tarbiat Modares University
2 - Associate Professor, Forestry Department, Tarbiat Modares University
Keywords: irrigation, Municipal effluent, Nutrient elements, Pinus eldarica, soil,
Abstract :
Municipal effluents can often contain significant concentrations of organic and inorganic nutrients. There is potential for these nutrients to be used as a fertilizer source when the water is recycled as an irrigation source. Therefore, long-term irrigation with municipal effluents can add large amounts of nutrients to the soil and plant. A case study was undertaken to assess the impact of municipal effluent irrigation on macro and micro-nutrient (N, P, K, Ca, Mg, Fe, Mn, Cu, Zn) concentration of soil and leaf of eldar pine (Pinus eldarica Medw.) trees, in south of Tehran. For this purpose, Data were collected using technique of systematic random sampling with 4 replicates in two 15 year-old-artificial eldar pine stands 1) under irrigation of municipal effluent and 2) irrigated with well water. Municipal sewage and well water were sampled daily (3 days in each month) from early June to late November. Results indicated that the concentrations of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sodium (Na), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) in municipal effluent and leaf of trees irrigated with municipal effluent were significantly greater compared with those of well water treatment. Application of municipal effluent resulted in a 1.5-fold increase in the concentrations of soil macro and micro-nutrients. The nutrients showed their greatest values in the upper layer of soil (0-15 cm). Irrigation using municipal effluent did not result in toxicity of nutrients in tree leaf and soil. The macro and micro-nutrient contents of leaf were correlated with their respective value in soil. It might be concluded that the municipal effluents could be utilized as a source of water and nutrients in afforestations.
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