Effect of Bacillus sp. and Trichoderma spp. on the Development of Banana Seedlings (Musa spp. AAA) in the Nursery Stage

The production of Musa spp. AAA(banana) generates significantforeign exchange globally. For this reason, its cultivation requires tools that ensure healthy and robust plants from the early stages of development. This research aimed to evaluate the effect of Bacillus spp. and Trichoderma spp. on the development of banana seedlings (Musa spp. AAA) in the nursery stage. The study was conducted at Quinta Herrera, located at km 23.2 of the Quevedo-Ventanas road. Species of Trichoderma isolated from the Microbiology Laboratory at the Technical State University of Quevedo and microorganisms from two commercial products were studied. The treatments applied at the soil level were: T1: T. asperellum, T2: T. yunnanense, T3: T. asperellum + T. yunnanense, T4: B. subtilis, T5: T. harzianum, T6: B. subtilis + T. harzianum, and T7: Absolute control. The trials were set up using a completely random design. The results showed that, with the combined application of B. subtilis + T. harzianum, the banana seedlings experienced significantly greater growth compared to the other treatments, with an average of 17.54 cm after 6 weeks of evaluation, and a pseudostem thickness of 12.50 mm during this period. Leaf emission was similar across all treatments; however, the development of the leaf area was greater in T6, which reached 1517.52 cm2 at 20 weeks of seedling age. Finally, the combined application ofthetwo native Trichoderma strains resulted in greater rootdevelopment, with longer roots (32.93 cm) and consequently higher fresh and dry root weight, with averages of 367.93 g and 145.84 g, respectively. In conclusion, T6 (B. subtilis + T. harzianum) is recommended for improving the development of banana seedlings in the early or vegetative phenological stage under greenhouse conditions.