RESPONSE OF NERIUM OLEANDER TO ABSORB HEAVY METALS FROM CONTAMINATED SOIL WITH DIFFERENT LEVELS OF SULFUR AND HUMIC*

Abstract

The research was carried out in the lath house wood canopy which belong to Agricultural Research and Experiment Station - College of Agriculture / University of Kirkuk from 1/3/2022 to 1/3/2023, to evaluat the ability of the oleander plant in the phytoremediation of heavy metals resulting from environmental pollutants that accompany the extraction and transportation processes. And refining and burning of oil companies, in addition to the exhaust gases of cars and private factories. The experiment was designed according to the randomized complete block design (R.C.B.D) with three replications. Two factors were used to enhance the ability of the oleander plant to absorb and accumulate heavy metals. The first is agricultural sulfur in three concentrations (0, 5, 10) g. pot-1,The second is humic in three concentrations (0,5,10) ml.pot-1 addition directly to the soil. The results of plant efficiency measures in extracting heavy metals showed an increase in the concentration of lead and cadmium in the shoot and root system with an increase in the concentrations of sulfur and humic. The values of the Translocation Factor (TF) and the Bioaccumulation Factor (BAF) also increased and were all values greater than one and for all concentrations of coefficients.

Keywords: Phytoremediation, Lead , sulfur, Humic acid, Nerium oleander.