Evaluation of plant growth-promoting capacity with symbiotic and symbiotic bacteria efficient in the biological fixation of nitrogen, in the cultivation of moringa (Moringa oleifera), in greenhouse

Abstract

The present research work was conducted with the aim of evaluating the growth-promoting capacity of symbiotic and non-symbiotic bacteria, using a strain of Azotobacter sp, a strain of Rhizobium leguminosarum, and a biomedium of Mexican origin (a consortium of microorganisms). Inoculants were prepared with these strains, and moringa seeds were individually inoculated with each strain, in combination with two strains, and using all three products according to the planned evaluations. Six treatment groups and one control group were formed. The results indicated high germination percentages in T4 (moringa seed + Rhizobium leguminosarum) and T7 (moringa seed + Azotobacter + Rhizobium leguminosarum and biomedium), with the highest germination percentage reaching 85.7%, surpassing the control group by 18%. The biomass of the aboveground and root parts, as well as plant height, in treatments that were inoculated with Azotobacter sp, Rhizobium leguminosarum, and biomedium individually or in combination, showed positive results, with no significant differences among them but superior to the control (moringa seeds without inoculation). It is concluded that the growth-promoting capacity of symbiotic and non-symbiotic bacteria in moringa is efficient, reflected in the biomass yield, which increased by 41% in the aboveground part and 65% in the root compared to the control.