Résumé:
The objective of this work is to evaluate the effect of different concentrations of diesel oil,
crude oil, and used engine oil in soil on the germination of seeds and the growth rate of two
plants: wheat (Triticum durum and lentil (Lens culinaris). All the analyses were carried out
after the same time after contamination of the soil. The experiments were conducted under the
laboratory conditions. To do this we have contaminated the soil with the three hydrocarbon
derivatives each with three concentration 0.25٪ (2.5 ml/kg), 0.5٪(5.0 ml/kg)and 1٪(10 ml/kg)
for the first one and 2.5 %(25 ml/kg), 5.0%(50 ml/kg) and 10%(100 ml/kg) for the last two.
There was a control for each plant test which was the untreated soil.
The effect of these pollutants on the germination rate was well illustrated in general by a
delay in the onset of germination by a port control for both plants. Crude oil and motor oil
were burned almost inhibitory effect of germination in two concentrations of 5% and 10%.
The results of physic-chemical analyses of the soil used in this work have a physical and
chemical fertility. It contains high levels of heavy metals such as Cr, Zn, Cu, and Ni. The
toxicity expressed by the test of germination and growth is moderate; it is high for most of the
concentrations of hydrocarbons reflecting tolerance.
Knowledge gained on the mainly metallic elements contamination levels of soil quality have
shown the presence of a risk of disruption of the functioning of these soils and a potential
danger to human health.
