[Response of annual Medicago spp. to two Rhizobium meliloti strains in the Tunisian semi-arid]
1996
Mezni, M.Y. (Institut National de la Recherche Agronomique, Ariana (Tunisia). Laboratoire de Productions Fourrageres) | Sifi, B. (Direction Generale de la Production Agricole, Tunis (Tunisia). Laboratoire de Production d'Inoculum)
Response of Medics inoculation was conducted using two Rhizobia strains (native and introduced inoculum) on three cultivars: M. truncatula var. Jemalong and two Tunisian ecotypes: M. polymorpha and M. murex. The treatments (T) were: T1- non inoculated cultivars, T2- non inoculated cultivars + 66 N ha-1, T3- inoculated cultivars with introduced inoculum (M-28), and T4- inoculated cultivars with native strain. Results have shown that inoculation increased dry matter yield and nitrogen content in both plant and soil. Native strain was more efficient for M. truncatula var. Jemalong and M. polymorpha. M. murex was not infected by any of the strains. M. polymorpha produced more nodules than the two other cultivars. Non inoculated cultivars + 66 N ha-1 and cultivars inoculated with native strain have equilibrated development for root and shoot systems. Cultivars under the other treatments will develop more roots than shoots leading to a yield decrease.
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