Synergistic effects of commercial biofertilizers with nitrogen fixing, arbuscular mycorrhiza fungi and phosphate solubilizing bacteria on soybean yield
التفاصيل البيبلوغرافية
العنوان:
Synergistic effects of commercial biofertilizers with nitrogen fixing, arbuscular mycorrhiza fungi and phosphate solubilizing bacteria on soybean yield
Numerous studies have been conducted focusing on the effectiveness of plant growth promoting (PGP) rhizobacteria with different PGP functions. Various commercial biofertilizers are available with promises of yield improvement and crop growth enhancement, but no studies have confirmed their effectiveness. This study seeks to evaluate the co-inoculation effects of commercial bioinoculants such as Phosphorus Solubilizing Bacteria -PSB (Myco Tea, Soluble Maxx, Symbion P and Symbion VAM), Arbuscular Mycorrhizae Fungi -AMF (Rhizatech) and rhizobial inoculants (LegumeFix and 1495MAR) on soybean growth. No phosphorus (P) was applied to the treatments but a positive control with optimal P concentration was included. Statistically significant (P≤ 0.001) positive effect upon co-inoculation of PSB bioinoculants and rhizobial strains was observed on shoot dry biomass when Soluble Maxx and Myco Tea were applied alone or co-inoculated with Bradyrhizobium. Interaction between Soluble Maxx and Bradyrhizobium produced the highest shoot biomass, with an increase of 66% (with LegumeFix) and 42% (with 1495MAR) above non-inoculated controls. These results indicated positive interaction between Bradyrhizobium and effective PSB commercial products suggesting that co-inoculation renders the biofertilizers more competitive in rhizosphere. Field studies are ongoing to confirm the effectiveness of these products in different agro-ecological zones. (Texte intégral)