Effect of Sewage Sludge on Some Macronutrients Concentration and Soil Chemical Properties

Document Type : Research Paper

Authors

1 Grad. Student of Soil Science, Isfahan University of Technology

2 Associate Professors of Soil Science, Isfahan University of Technology

3 Associate Professor of Horticulture, Isfahan University of Technology

Abstract

Sewage sludge as an organic fertilizer has economic benefits. Land application of sewage sludge improves some soil chemical and physical properties. The objective of this study was to evaluate the effect of sewage sludge on soil chemical properties and macronutrient concentration in acid and calcareous soils. The study was carried out in a greenhouse using factorial experiment design as completely randomized with three replications. Treatments included : four levels of 0 or control, 50, and 100, 200 ton ha-1 sludge and one level of chemical fertilizer (F) consisting of 250 kg ha-1 diammonium phosphate and 250 kg ha-1 urea, and soil including soils of Langroud, Lahijan, Rasht, and Isfahan. As a major vegetable , crop spinach (Spinacea oleracea) was grown in the treated soils. Soils samples were analyzed for their chemical properties after crop narvesting. Application of sewage sludge significantly increased plant available k, P, total N, organic matter, electrical conductivity and cation exchange in the soils. Soils pH significantly decreased as a result sewage sludge application. The effect of sewage sludge on plant yield was significant. Overall, the results indicated that sewage sludge is potentially a valuable fertilizer. However, the sludge effect on soil EC and heavy metals should be taken into consideration before its widespread use on cropland.

Keywords

References

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شماره 53- سال 1384                                                                                                                        آب و فاضلاب
 
 
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Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 16, Issue 1 - Serial Number 1
Serial number: 53
March and April 2005
Pages 15-22

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