Contents of lead and cadmium in barley plants as directly affected by some organic manure applications in a sandy soil [electronic resource].

Includes references.

the present works was carried out as a pot experiment to study the effect of some organic manure (compost, biogas and sewage sludge) in addition to untreated soil as a control. Five ascending rates 0.5, 1, 2, 3, or 4 % on the content of Pb and Cd in sandy soil and the grown barley plant. The obtained results showed that, AB-DTP A extractable Pb and Cd increased significantly due to application of organic manure and the increases progressed with increasing the rate of application. The average values of available Pb and Cd in the soil ranged from 0.15 to 7.55 and 0.02 to 0.37 mg kg-I respectively. The soil treated with sewage sludge and biogas manure gave relatively higher significantly of the AB-DTP A extractable Pb and Cd than that treated with the compost or manure. The highest concentrations of Pb and Cd ware less than the maximum concentration permissible for arable lands 40 and 1.0 mg kg-I for Pb and Cd, respectively. High extractable Pb in the treatment of 2 % application of sewage sludge with significant difference over the lower concentration. On the other hand, results showed that dry matter weight (gm porI), weight of 100 grains and height of barley plants as affected by application of compost , biogas or sewage sludge manure to a sandy soil were significantly increased over control due to supplying with organic matter. Also, data indicated that biogas was the mast effective on 100 grains of barley plants followed by sewage sludge in height and dry matter yield and then compost. However, the difference in grain yield obtained due to application of biogas manure or sludge applications was insignificant. The highest rate of organic manure 4.0% showed a insignificant decrease in dry weight, of 100 grains and plant height compared with the rate of 3.0 %, which is considered as the optimum rate for producing the highest dry matter yield. Data also revealed that the concentration of Pb and Cd in barley straw and grains progressively and consistently increased by increasing the rate application of compost, biogas and sewage sludge manure and the straw exhibited more accumulation than grains. On the other hand, Pb and Cd contents of straw and grains were increased by sewage sludge manure, flowed by biogas manure and then compost.

Summary in Arabic.

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