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Effect of urban treated sewage sludge on concentration of lead and cadmium in parsley and its soil

E.Nikzad, M. Kalbasi, M. Hoodaji, J. Fallahzade

Department of Soil science, Faculty of Agriculture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

Young Researchers and Elite Club, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

Key words: Sewage sludge, Lead, Cadmium, Parsley.

achilleaAbstract

Using sewage sludge, as fertilizer, in farmlands has been very prevalent. It is rich in plants nutrients but its heavy metals high concentration leads to contamination of soil, plants and food chain jeopardizing the human and animals’ health. This study aimed to examine the effect of using urban sewage sludge on concentration of lead and cadmium in parsley and its soil. It was done in the form of a completely randomized factorial experiment with six levels of sewage sludge and three replications in a greenhouse. The amounts of 0, 1, 2, 4, 8, and 16 percent of the soil dry weight of the sewage sludge were added to the pots having soil of three areas namely Baharan, Najvan and Shakrekord. Next, the parsley transplants were planted in the vases. Having reached to the 4-5 leaf-stages, the plants were harvested and each vases soil and plant was analyzed. Application of sewage sludge decreased soil pH and at the same time increased and electrical conductivity in soils. Generally decrease and increase was proportional to the sewage sludge application rates. Sewage sludge application of increased the soil total and available lead and cadmium concentration significantly. In most cases, the amount of increase was proportional in with the sludge amount. Using the sewage sludge had a significant effect on concentration of lead and cadmium, and increased their concentration in parsley and enhanced its yield.

Get the original articles in Source: Volume 6, Number 6, June 2015 – JBES

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