USE OF THE EDIBLE AFRICAN LETTUCE (LAUNAE TARAXCIFOLIA) TO EVALUATE THE REMEDIATION OF SOIL CONTAMINATED WITH LEAD AND CADMIUM
The ability of Launae taraxcifolia, a common herb and vegetable, to remove lead and/or cadmium from the soil was investigated. This vegetable plant is a delicacy among the Yorubas in Western Nigeria and parts of West Africa. Different concentrations of each of the metals (0, 15, 25, 50 and 75 mg/kg) were prepared and mixed thoroughly in 2 kg of ordinary soil. Replicate control and treated soil samples with one plant each was observed for 70 days for the effect of the metals on vegetative growth. After this time, results showed that plant height, leaf number and leaf area of L. taraxcifolia plants were not adversely affected by lead treatment of soils. Further evaluation showed that these plants had normal growth and development.