Senegalia senegal (L.) Britton. response to microbial and manure amendments for rehabilitation of waste rock dumps in the mining site of Essakane in Burkina Fas

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Hendi H. Yonli,4; Godar Sene; Damase P. Khasa ; Kadidia B. Sanon

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Senegalia senegal (L.) Britton. is a multipurpose and widespread mycorhizobial legume of the SubSaharan likely to colonize disturbed mining sites due to its adaptive capacity to dry lands. Multiyear experimental trials using this species were conducted in a nursery and seedlings were outplanted on waste rock dumps in Essakane in northeastern Burkina Faso. The inoculation of two arbuscular mycorrhizal (AM) fungi (the native Glomus aggregatum DAOM2277128 strain and the commercial Rhizophagus irregularis DAOM197198 strain) and one Mesorhizobium plurifarium ORS3588 strain were studied on waste rock dumps with two doses (25 and 50%) of manure amendment to determine whether the microbial inoculation improves the growth and survival rates of seedlings. Inoculation under manureen-rich substrates did not consistently increase plant height and dry mass between treatments. The overall trend was that plants inoculated with G. aggregatum alone or concurrently with G. intraradices and/or Mesorhizobium plurifarium ORS3588 showed the best increase in these variables. Nevertheless, under unamended substrates, inoculation with G. aggregatum and its combination with M. plurifarium and/or R. irregularis significantly enhanced the root colonization rates, plant growth and survival. However, inoculation with R. irregularis or with M. plurifarium alone did not show any increase in these parameters, even though nodulation was significantly improved by the later treatment. Data also showed that manure-enrich soils harbored less nodulation and root AM colonization but increased significantly the plant growth and dry mass in both the nursery and mine field conditions. Plant survival, however, was reduced in manure-enrich soils. Our results support the general conclusion that microbial inoculation and manure-enrich substrates could be an option for mining site rehabilitation using S. senegal. However, data suggested that the addition of manure amendments should be approached with caution as high rates may induce further stress in plant symbioses and inhibit their performance in waste rock dumps.

Resource Type:
Conference Presentation, SER2021

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