EFFECT OF USED ENGINE OIL POLLUTED SOIL ON THE GROWTH, SEEDING ESTABLISHMENT OF SOYBEANS AND SOIL PHYSICOCHEMICAL PROPERTIES
Abstract
ABSTRACT
Used engine oil contamination in soil significantly affects the growth and development of soybean plants. This study was carried out to investigate the impact of different levels of used engine oil contamination on soil properties and its subsequent effects on the growth and seedling establishment of soybean (Glycine max). Soyabean seed was planted in soil treated with 6 different concentrations of used engine oil (0,90,110,130,150 and 170ml). The experiment was conducted using a completely Randomized Design (CRD) replicated four times and the effects on percentage germination, number of leaves and height of leaves were monitored for over 4 weeks.
Soil samples were analyzed for physicochemical properties, including texture, pH, nutrient content (phosphorus, sodium, magnesium, potassium), and Organic carbon content. Germination percentage decreased with increasing oil concentration, with the highest germination rate (95%) in the control group and the lowest (28.28%)at 170ml.
At day 4, the 90ml treatments showed greater plant height than other treatments and the control. Significant differences were noted in plant height across treatments, particularly in the second week, with the control group showing the highest growth.
The number of leaves varied across treatments, with significant differences observed in the fourth, where the control had more leaves compared than the contaminated soil at all levels. The Phytobiomass tolerance index and percentage dry matter was determined after the growth of soybean seeding and it was observed that the Control had the highest tolerance index (0.79) and percentage dry matter (78.8%) than the contaminated soil at all levels. These findings indicates the negative impact of used engine oil on soybean growth, underscores the need for proper disposal and management of used engine oil and also Implementing effective soil remediation techniques and promoting environmental awareness which are crucial to safeguard soil health and agricultural productivity.
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