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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/4542

Title: Effect of sewage sludge on some chemical properties of calcareous sandy soils
Authors: Al-Wabel, M.I.
Al-Omran, A.M.
Shalaby, A.A.
Choudhary, M.I.
Keywords: Sewage Sludge
Chemical Properties
Sandy Soils
Soil science
Issue Date: 1998
Citation: Communications in Soil Science and Plant Analysis: 29(17&18); 2713 - 2724
Abstract: City sewage sludge was applied to the surface layer (0-10 un) of two sandy soils, slightly calcareous with 8.9% CaCO, and moderately calcareous with 26.7% CaCO,. at the rates of 0.25,50,75, and lO0 Mg ha. The effects of sewage sludge and Us rates on total soluble salts, pi I of soils and concentration and movement of some heavy metals within soils were investigated. Soil samples were packed at bulk density of 1.5 g cm' in PVC columns and incubated for 19 weeks. The results indicated that total soluble salts (EC) of the treated layer increased with increasing sewage sludge rates Soluble salts also increased with an increase in soil depth for both soils. The pi I values of treated layers in two soils decreased with increasing sewage sludge rates. With increasing sewage sludge rates, concentrations of heavy metals [cobalt (Co), nickel l Ni). cadmium (Cd).and leaf (Pb)| increased in the treated layers compared to the untreated layers and their mobility was restricted mostly to the upper 30-cm depth Movement of Co and Pb in both the soils was predominately limited up lo ,i depth of •!() cm for Co and 5 cm for Pb below the treated soil lavcr Nickel and (VI movement was mostlv limited to a depth of 10 cm in slightly calcareous soil and 5 cm in moderately calcareous soil Metal movement in Ihc respective soils is ranked as Co *Ni I'd *Phand Co -Ni Cd Pb The low concentrations of heavy metals and the restricted mobility with soil depth, surest that this material may be used Ii>r agricultural crop production without any toxic effect on plants.
Description: Mr. M.I. Al-Wabel Department of Soil Science, College of Agriculture, King Saud University P.O. Box 2460. Riyadh 11451. Saudi Arabia.
URI: http://hdl.handle.net/123456789/4542
Appears in Collections:College of Foods And Agricultural Science

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