Summary
Surface samples were collected from a loamy sand area where liquid sewage sludge of Cairo City is used in irrigation for 2, 25, 35 and 45 years and tested for their levels of Zn, Fe and Mn.
The use of liquid sewage sludge year after year in irrigating the loamy sand soil has markedly increased the levels of these micronutrients (total and soluble forms) in soil. Some exceptions were observed and were attributed to the adsorption of these elements by organic materials.
It was concluded that use of liquid sewage sludge in irrigating sandy soils could be considered a soil improver or as a plant nutrient source but attention should be focused on N-mineralization and environmental pollution, particularly in future.
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Abdou, F.M., El-Nennah, M. Effect of irrigating loamy sand soil by liquid sewage sludge on its content of some micronutrients. Plant Soil 56, 53–57 (1980). https://doi.org/10.1007/BF02197952
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DOI: https://doi.org/10.1007/BF02197952