Effect of the added Spent Engine Oil levels and Fermented Sheep Manure on some Properties of Gypsiferous Soil

• Nabaa Majed Hamad Al-Anzi Ali Hussein Ibraheem Al-Bayati* Mohammed Musleh Sharqi

  Author

 The increasing discharge of used motor oil into the environment, resulting from the growing use of cars and other engines and their subsequent maintenance, is a significant environmental concern. Therefore, this study aimed to evaluate the effect of used motor oil and fermented sheep manure on the properties of gypsiferous  soil. A factorial experiment was conducted using a completely randomized block design under laboratory conditions. The first factor involved the addition of four levels of used motor oil: 0%, 2%, 4%, and 6% (O0, O2, O4, and O6). The second factor involved the addition of three levels of fermented sheep manure: 0, 10, and 20 Mg h^-¹ (M0, M1, and M2). The soil was incubated at 50% of the field capacity for four weeks. After the incubation period, the soil was sampled, and some of its physical and chemical properties were determined. The results showed a significant effect of adding both study factors and their interaction on the studied properties. Adding oil caused a decrease in saturated hydraulic conductivity 29.7%, electrical conductivity 35.3%, soil pH 2.3%, and soil content of Nitrogen 21.4%, Phosphorus16.7%, Potassium 4.4%, and available Zinc 14.3%, while increasing soil content of available Iron 23.2% and Lead 25.5%. Regarding the effect of adding  fermented sheep manure, the results indicated a significant opposite effect to that of the first factor, increasing saturated hydraulic conductivity 27.6% and soil content of available Nitrogen 48.7%, Phosphorus 101.8%, Potassium 105.5%, Iron 188.1%, with a clear increase recorded in lead movement and availability in the soil. This suggests the potential use of organic materials as a tool to mitigate the negative effects associated with spent engine oil

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