Mununga et al., J. Appl. Biosci. 2017 Essai de phytostabilisation des sites contaminés par les éléments traces métalliques dans la région de Lubumbashi : Gamme de tolérance de Jatropha curcas au sulfate de cuivre. 11080Journal of Applied Biosciences 112: 11080-11091 ISSN 1997-5902 Essai de phytostabilisation des sites contaminés par les éléments traces métalliques dans la région de Lubumbashi (RD. Congo) : Gamme de tolérance de Jatropha curcas au sulfate de cuivre. ABSTRACT Problem: Industrial activities, especially in the sector of metallurgy in the city of Lubumbashi, caused a high contamination of the soil around the factories via their atmospheric discharges (channelled and diffuse). However, contaminated soils used for various purposes in forestry, agricultural or residential areas, has negative impact in their surrounding; increasing pollution by adding several amount of heavy metals, constitute an important source of damage for its immediate environment and nearby populations.Objectives: This study was conducted to evaluate the growth and phytostabilisation potential using Jatropha curcas on a contaminated substrate at different doses of copper sulphate. Methodology and results: The experiment was conducted at the experimental field of the Faculty of Agricultural Sciences, University of Lubumbashi, following a completely randomized system comprising 4 repetitions of 7 treatments. The determination of the tolerance range was subjected to variance analysis (ANOVA), while the other vegetative parameters were subjected to the multiple comparison test (Tukey test). Thus, the chemical composition of the various treatments was analyzed to deduce the tolerance threshold of Jatropha curcas to cupric contamination. Results indicated that Jatropha curcas was vigorous on treatments with low doses of copper sulphate (250, 500 and 1000 mg.kg-1 CuSO4), while high doses of copper sulphate induced of seedling mortality (2000, 4000 and T6 = 8000 mg.kg-1 CuSO4), except for only transplanted individuals which had intermediate results for the treatment contaminated with (2000 mg.kg-1 CuSO4), unlike to seeded individuals. Furthermore, bioaccumulation and translocation calculations display high levels of copper accumulated in the tissues of the roots due to the soil content and to the low level of Cu, translocation gives Jatropha curcas the power to minimize the rate of passage towards the aerial parts. Conclusion and application of results: the phytostabilisation of soils polluted by the use of heavy metals is an effective and less costly solution, thus the use of Jatropha curcas would be an alternative to achieve the goal being given that can tolerate concentrations of copper itself (Up to 2000 ppm when using transplanting), thusly the domestication of this species and his botanical knowledge is interesting.

Mpundu et al., J. Appl. Biosci. 2017 Influence des sols contaminés en cuivre sur le développement de deux variétés (locale et améliorée) de légumes dans la région de Lubumbashi (RD. Congo). 11410Journal of Applied Biosciences 115: 11410-11422 ISSN 1997-5902 Influence des sols contaminés en cuivre sur le développement de deux variétés (locale et améliorée) de légumes dans la région de Lubumbashi (RD. Congo). 11411ABSTRACT Objectives : In the former province of Katanga, subsistence agriculture is predominantly traditional. While these soils are contaminated by industrial effluent, the result is an increase in the number of substances rich in etms (zinc, cobalt, lead, arsenic, copper, cadmium). The objective of this study was to assess the behavior of African carrot and eggplant culture on contaminated soils and to determine the potential risk of food chain contamination by the MTEs in Lubumbashi City. Methodology and results : Four soil types were harvested to install the two crops (African carrot and aubergine).The experiment was carried out in accordance with a factor 4 * 2 apparatus, thus the main factor consisted of two variants of carrot and aubergine (improved variety and local variety) and the secondary factor consisted of 4 soil variants including Kipushi soil, Pengapenga soil, Luwowoshi soil (Ruashi), and Kassapa farm soil. The results showed that the soils of the vegetable gardens of the city of Lubumbashi, as well as the carrot biomasses installed on these soil, showed very high concentrations compared to the established norm, whereas the eggplant biomasses that did not Contamination, regardless of the contamination of the substrates. Conclusion and application of results: Improved varieties of carrots and eggplants from France are well behaved compared to local varieties commonly used by farmers in the city of Lubumbashi, we will advise farmers to use these varieties Provision to avoid the risk of contamination of the food chain and in the next studies that an in situ experimentation is carried out using the same varieties.