Resumen

BECQUER-GRANADOS, Carlos José et al. Inoculation of Andropogon gayanus Kunth with Glomus cubense and Azospirillum brasilense in the presence of drought stress. Pastos y Forrajes [online]. 2023, vol.46  Epub 12-Abr-2023. ISSN 2078-8452.

Objective: To evaluate the response of Andropogon gayanus Kunth to inoculation with Glomus cubense and Azospirillum brasilense, in the presence of drought stress.

Materials and Methods: In an established area of A. gayanus, an establishment cutting was performed after seed harvest and inoculation was done with EcoMic® (Glomus cubense) and INICA-8. The experimental design was a complete randomized block, with seven treatments and eight replicas. The treatments consisted of: EcoMic® immediately after cutting, INICA-8 immediately after cutting, INICA-8 + EcoMic® immediately after cutting, EcoMic® at cutting+ INICA-8 (15 days), INICA-8 at cutting + EcoMic® (15 days), absolute control and fertilized control (150 kg N/ha, NH3NO4). The dry weight of the aerial part, stem length, length of the flowering section of the stem, length of the inflorescence, dry weight of the racemes and flowering were evaluated. Variance analysis was performed. Differences among means were determined by Fisher’s LSD.

Results: Area dry weight was higher (p < 0,0001) in the fertilized control than in all treatments (12 036,1 kg/ha). The EcoMic® (9 612,5 kg/ha), EcoMic®+INICA-8 (8 475,0 kg/ha) and EcoMic® (cutting)+INICA-8 (15 days) treatments were superior to the absolute control (6 822,2 kg/ha), as well as to the other inoculated treatments. The EcoMic®+INICA-8 treatment showed statistical superiority in stem length (189,7 cm), raceme dry weight (0,071 g) and flowering (0,4462 %). EcoMic® (cutting)+INICA-8 (15 days) was higher in inflorescence length (16,39 cm) and in length of the flowering section of the stem (56,08 cm), although the fertilized control did not differ from these treatments.

Conclusions: The single application of INICA-8 had no higher effect on any of the studied variables. However, EcoMic®, at the time of cutting, alone or combined with Azospirillum, was determinant in most of the variables. These results prove the importance of the application of EcoMic® in this crop under drought stress conditions, as well as the synergy among the microorganisms that were inoculated, when combined with each other due to a higher effect on the plant.

Palabras clave : Gramineae; microorganisms; synergism.

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