Abstract
An experiment was conducted in the University of Nigeria Nsukka Teaching and Research Farm to determine the effect of spent auto-engine oil on soil and soybean in a Randomized Complete Block Design. Treatments were four levels (0, 1, 2 and 3 %) of spent auto-engine oil (SPO). Top soil samples were collected at 0, 12, 24 and 36 months and analyzed. Results indicated that infiltration rates in plots under 3 % SPO was reduced from 1.40 cm h-1 in control plots to the lowest value of 0.07 cm h-1 compared to 0.27 cm h-1 in 1 % treatment in the first 12 months. Plots contaminated with 3 % SPO gave the lowest Ks values of 6.29, 7.68 and 9.43 cm h-1 in the 12th, 24th and 36th months respectively. Data on plant samples showed that 2 % and 3 % SPO contaminations reduced soybean germination from 99 % (control) to 86 and 68 % respectively in the first cropping season whereas 1 % SPO was observed to significantly increase leaf area, dry matter content and grain yield from control values of 52.6 cm2, 3.01 t ha-1 and 0.72 t ha-1 to 54.5 cm2, 4.20 t ha-1 and 0.97 t ha-1 respectively.Keywords: Contamination, soybean, soil physical properties, spent engine oil, Ultisol
Highlights
Nigeria is a major petroleum producing country in the world and the exploration and exploitation of petroleum has brought so much pollution to the Nigerian environment, especially in the Niger delta region of the country
Soybean is one crop that its cultivation is expanding in Nigeria as a result of its nutritive and economic importance and diverse domestic usage, there is paucity of information on the response of soybean to spent engine oil contamination in the Ultisols of South-eastern Nigeria
Effect of spent auto-engine oil contamination on Total Hydrocarbon Content (THC) of soil cultivated to soybean: Increase in the dose of spent engine oil contamination expectedly increased the total hydrocarbon content of the soil (Fig.1).The contamination of the soil with 3 % oil increased total hydrocarbon content from 905 mg kg-1 in control soil to 24429 mg kg-1 whereas the 1 % contamination increased THC to 7455 mg kg-1 in the first 12 months
Summary
Nigeria is a major petroleum producing country in the world and the exploration and exploitation of petroleum has brought so much pollution to the Nigerian environment, especially in the Niger delta region of the country. This study was focused on evaluating the effects of spent auto-engine oil on selected soil hydrological properties, growth and yield components of soybean plant.
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