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The results indicate that soil Cd decreased significantly by planting S. nigrum. The Cd concentrations decreased averagely from 2.75 mg kg-1 to 2.45 mg kg-1 in the first year and 2.33 mg kg-1 to 1.53 mg kg-1 in the second year, separately. Decrease by a factor of 10.6 % in first year and 12 % second year. | Journal of Science and Technology 54 (2A) (2016) 78-83 A TWO-YEAR FIELD STUDY OF PHYTO REMEDIATION USING SOLANUM NIGRUM L. IN DONGNAI, VIETNAM Nguyen Thanh Hung1, *, Mai Huong Tra2 1 Thu Dau Mot University, Binh Duong, No 6 Tran Van On street, Phu Hoa ward, Thu Dau Mot city, Binh Duong province, Vietnam 2 Lac Hong University, Dongnai, No 10, Huynh Van Nghe street, Buu Long ward, Bien Hoa city, Dong Nai province, Vietnam * Email: hungphuocan@gmail.com Received: 5 May 2016; Accepted for publication: 26 June 2016 ABSTRACT A two- year in-situ phytoremediation trial was conducted in Dongnai province. The phytoremediation efficiency of Solanum nigurm L. was detected, by monitoring the change of soil Cadmium level in the 0 - 20 cm soil depth. The results indicate that soil Cd decreased significantly by planting S. nigrum. The Cd concentrations decreased averagely from 2.75 mg kg-1 to 2.45 mg kg-1 in the first year and 2.33 mg kg-1 to 1.53 mg kg-1 in the second year, separately. Decrease by a factor of 10.6 % in first year and 12 % second year. After two years phytoremediation by S. nigrum, Cd concentrations of the seven experimental plots with S. nigrum growth decreased from 2.75 mg kg-1 to 1.53 mg kg-1, and decrease by a factor of 24.9%. Therefore, using S. nigrum for phytoremediation of Cd contaminated farmland soils seems very promising, and we can conclude that S. nigrum will get a better performance in the warmer area, as the temperature of the experimental area is relatively lower. Key words: In-situ, phytoremediation, cadmium, Solanum nigrum L., efficiency. 1. INTRODUCTION Among the heavy metals，Cd has a very high mobility in soil- plant systems, with propensity to damage both human health and the functioning of ecosystems [1]. Therefore, it is necessary to put remediation of Cd-contaminated soils into action. Until now, many published papers suggested that phytoremediation could potentially be used to remediate heavy metal contaminated soils [2], as compared
