Possibilities of reducing heavy metals toxicity by using organic residues

摘要

A pot experiment was carried out in the greenhouse of National Research Centre to study the effect of some organic residues (farmyard manure, peanut residue and potassium humate) on different heavy metals toxicity on spinach plants under polluted and unpolluted soils. Results pointed out that organic residue increased plant height, leave number/plant and yield as compared with control in both polluted and unpolluted soils. Data also showed that decreasing NPK content and uptake in spinach plants grown on metal when contaminated soil with heavy metals whereas the application organic residue increased NPK content and uptake. Application of organic residues to the soil, significantly reduced Cd, Pb and Zn concentration in spinach the plant under study as compared with control under both polluted and unpolluted soils. Also, organic matter resulted in an increase in total Zn, Pb and Cd conent in both polluted and unpolluted soils as compared with control and NPK treatments.