Saturday, 15 July 2006

Effect of Municipal Waste Compost Leachate on Yield and Trace Elements Uptake by Lettuce and Maize in Calcareous and Non-Calcareous Soils.

Samaneh Aryabod1, Amir Fotovat1, Amir Lakzian2, and Gholamhossein Haghnia1. (1) Ferdowsi Univ of Mashhad, Dept of Soil Science, PO Box 91775-1163, Mashhad, Iran, (2) Ferdowsi Univ, Azadi Sq., Mashhad, Iran

In the process of conversion of solid waste refuses to compost, leachate is produced. Although municipal waste compost leachate is one of the problems of compost production in Iran, it may be considered as a source of nutrient and water. Municipal waste compost leachate contains trace elements (Fe, Cu, Zn and Mn) that can be used by plants. Trace elements at sufficient levels are needed for complete cycle of plant growth and have important impact on increase of quantity and quality of agricultural plant yield. A greenhouse experiment was conducted with two watering treatments (distilled water+20% volume leachate and distilled water), two plants (lettuce, Luctuca sative and maize, Zea mays) and two different soils (calcareous and non-calcareous) in a factorial complete randomized design with three replications. Zinc concentration in lettuce and maize in both soils tested increased under the leachate treatment ,significantly (p<0.05) . Copper concentration in lettuce and maize in both soils studied diminished under the leachate treatment. In both soils tested, the order of trace elements concentrations increase in both plants was Zn > Fe.> Mn > Cu .The results of soil analysis showed that irrigation with leachate decreased soil pH significantly and increased soil electrical conductivity, organic carbon and soluble Na and K (P<0.05). Leachate application also increased DTPA extractable Fe, Zn and Mn. In both soils, leachate application decreased DTPA extractable Cu which was not statistically significant. In general, use of leachate in soil at amount of distilled water+20% volume leachate for lettuce and maize had positive effect on plant yield. Concentration of Fe, Cu, Zn, and Mn in plants studied did not exceed standard permissible levels of the metals with the application of leachate as liquid organic fertilizer. Keywords: Municipal waste compost leachate, Trace elements, Lettuce , Maize, calcareous soil

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