JCBPS; Section C; November 2015 – January 2016, Vol. 6, No. 1; 154-165. E- ISSN: 2249 –1929 Journal of Chemical, Biological and Physical Sciences An International Peer Review E-3 Journal of Sciences Available online at www.jcbsc.org Section C: Physical Sciences CODEN (USA): JCBPAT Research Article 154 J. Chem. Bio. Phy. Sci. Sec. C, November 2015 – January 2016; Vol.6 No.1; 154-165. Assessment of the Capability of Wetlands Plants Organs to Fix Nutrients and Heavy Metals in Ndobogo Wetland, Southern Province of Rwanda Prof. Elias Bizuru 1 , Ms Germaine Hirwa 1 , Mr Emmanuel Nkundimana 2 , Prof. Théoneste Muhizi 1 , MrErasme Uyizeye 1 , Ms.Aliane Umurerwa 3 , Mrs. Laure B. Kananura 3 1 University of Rwanda, College of Science and Technology, P. O. Box 117, Huye, Rwanda 2 University of Rwanda, College of Agriculture, Animal Sciences and Veterinary Medicine, Busogo, Rwanda 3 COAIRWA: Cooperative of rice cropping in Rwabuyemarshaland, Huye, Rwanda UNDP/GEF Received: 03 December 2015; Revised: 10 December 2015; Accepted: 15 December 2015 Abstract: To investigate the cleaning capacity and nutrients uptake in wetland most abundant plants species, Digitaria velutina, Oryza sativa, Cyperus latifolius, Persicaria senegalensis species have been investigated in Ndobogo marshland, Southern of Rwanda. Leaves, stems and roots of the four species were collected, crushed using destruction tubes and then dried in oven at 105 0 C. Major nutrients (N, P, K, Ca, Mg) and some heavy metals (Fe, Cd, Pb, Cr, Cu, Mn, Zn) were thereafter analyzed on an UV/Vis Spectrophotometer CECIL 2041 and on Atomic Absorption Spectrometer (Perkin Elmer Precisely A Analyst 200), respectively. For all heavy metals studied, the iron was accumulated in all plants species with the highest concentration inside roots of Persicaria senegalensis (1022.5mg/100g). Lead was not detected anywhere. Persicaria senegalensis was also the best species in Cr and Cd uptake from the marshland. The same trend was observed for total nitrogen whose concentration was dominant in the leaves of Persicaria senegalensis (1826.3mg/100g), while the highest rate of total phosphorus concentration was detected in the roots of Oryza Sativa (973.8mg/100g). Persicaria senegalensis and Cyperus latifolius have the highest nutrients uptake rate with higher concentrations inside leaves. Therefore, those plant species may play a very good cleaning role by removing