Effect of different rates of Cd on growth and chemical composition of spinach
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 7, Issue 12
Abstract
Heavy metals are one of the most important environmental pollutants and their accumulation in agricultural products and food can be dangerous for human health. Vegetables are one the most important components of our food diet which contain essential elements and maybe contaminated with heavy metals. In order to study the effects of different levels of soil available Cd on growth and chemical composition of spinach, a factorial experiment with completely randomized design and three replications was conducted in greenhouse of Zanjan Agricultural Research Center in 2009. In this experiment factorial combinations of five levels of Cd (0, 10, 20, 40 and 80 mg/kg soil) were used as 25 treatments using cadmium sulfate to artificially contaminate soil samples. Three months after sowing spinach seeds, plants from different treatments were harvested and their biomass and chemical composition were determined. The results of the experiment showed that Increase in available form of soil cadmium up to 20 mg/kg increased the dry weight of aerial parts in spinach but higher concentrations of this element decreased the spinach biomass significantly. With increase in available form of soil Cd up to 40 mg/kg the Cd content of leaf increased but at higher concentrations of soil Cd the concentration of Cd in leaf decreased significantly. With increase in concentration of soil Cd the leaf concentrations of Cu, Zn, Mn and P decreased but that of Fe increased significantly.
Authors and Affiliations
Leila Rezakhani *| Department of agriculture, Karaj Branch, Islamic Azad University, Iran. email: Leila.rezakhani@yahoo.com, Ahmad Golchin| Department of agriculture, Zanjan University, Iran., Saeed Samavat| Member of scientific board, Soil and Water Research Institute, Karaj, Iran.
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