Abstract Organic compounds from the compost of agricultural waste have been increasingly used in the formulation of substrates for fruit seedlings production. Microorganisms can enhance the beneficial effects of fertilizers on the plant, but reports on the use of endophytic strains to promote banana plant growth are rare. The goal of this study was to investigate the ideal mixture of soil and organic compound with Bacillus sp. and Trichoderma asperellum inoculations for optimal growth and nutrient content of banana seedlings. A Greenhouse experiment was arranged in a factorial scheme (3 × 2 × 2)+3, five times replicated, with the following factors: (a) substrates consisting of three organic compound and soil ratios – 20:80, 40:60, 60:40 (v/v); (b) Bacillus sp. inoculation – with [B+] and without [B-]; and (c) Trichoderma asperellum inoculation – with [T+] and without [T-]. Additionally, the following controls for substrates consisting of soil free of organic compound (0:100) were also considered: [B+T-], [B-T+], and [B-T-]. After 100 days from planting, plant height (H), pseudostem diameter (D), H/D ratio, number of leaves, total leaf area, root volume, shoot and root dry mass, net photosynthesis, and contents of chlorophyll, carotenoid, nitrogen (N), phosphorus (P) and potassium (K) were evaluated. Results showed that the substrate 40:60 with Bacillus sp. or Trichoderma asperellum inoculation provides the best morphophysiological quality to banana seedlings. The strains also showed potential to promote plant growth in different ways, either by helping phosphate solubilization or by favoring auxins and hydrolytic enzymes synthesis.

中文翻译：

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研究土壤和有机化合物与芽孢杆菌的理想混合物。和 Trichoderma asperellum 接种以实现香蕉幼苗的最佳生长和营养含量

摘要 农业废弃物堆肥中的有机化合物越来越多地用于配制果苗生产基质。微生物可以增强肥料对植物的有益作用，但关于使用内生菌株促进香蕉植物生长的报道很少。本研究的目的是研究土壤和有机化合物与芽孢杆菌的理想混合物。和 Trichoderma asperellum 接种以实现香蕉幼苗的最佳生长和营养含量。温室试验按因子方案 (3 × 2 × 2)+3 安排，重复 5 次，因子如下： (a) 由三种有机化合物和土壤比例组成的基质 - 20:80、40:60、60 :40 (v/v); (b) 芽孢杆菌属。接种 – 有 [B+] 和没有 [B-]；(c) Trichoderma asperellum 接种 - 有 [T+] 和没有 [T-]。此外，还考虑了以下对由不含有机化合物的土壤 (0:100) 组成的基质的控制：[B+T-]、[B-T+] 和 [BT-]。种植 100 天后，株高 (H)、假茎直径 (D)、H/D 比、叶数、总叶面积、根体积、芽和根干重、净光合作用、叶绿素、类胡萝卜素含量、对氮 (N)、磷 (P) 和钾 (K) 进行了评估。结果表明底物与芽孢杆菌属 40:60。或 Trichoderma asperellum 接种为香蕉幼苗提供最佳形态生理质量。这些菌株还显示出以不同方式促进植物生长的潜力，要么通过帮助磷酸盐溶解，要么通过促进生长素和水解酶的合成。