Nutrient accumulation in the leaves and production of Tamani grass inoculated with Azospirillum brasilense

• Autor(a) principal: Andrade, Reginaldo Almeida
• Data de Publicação: 2022
• Outros Autores: Brito, Rychaellen Silva de, Carvalho, Cleverson Agueiro de, Silva, Sandra Bezerra da, Drumond e Silva, Mayara Almeida, Moraes, Keilyson Naazio Oliveira
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Verde de Agroecologia e Desenvolvimento Sustentavel
• Texto Completo: https://www.gvaa.com.br/revista/index.php/RVADS/article/view/9152
• topic: Phosphate fertilization; Azospirillum brasilense; Biological nitrogen fixation; Fertilización fosfatada; Azospirillum brasilense; Fijación biológica de nitrógeno; Adubação fosfatada; Azospirillum brasilense; Fixação biológica de nitrogênio

The implantation of pastures can be favored by strategies that combine conventional methods of cultivation with the inoculation of microorganisms that promote plant growth, such as the rhizobacterium Azospirillum brasilense, which are capable of improving the nutritional status of plants through several mechanisms, including the phosphate solubilization and biological nitrogen fixation, thereby reducing the need to apply chemical fertilizers. The purpose was to evaluate forage production and macronutrient contents in the leaves of Tamani grass, fertilized with natural phosphate and inoculated with Azospirillum brasilense. The experiment was carried out in a greenhouse, in a completely randomized design, organized in a 2 x 2 x 5 factorial scheme, with 3 replications. The treatments consisted of the presence and absence of rhizobacteria; two sources of phosphorus (triple superphosphate and natural phosphate); and five nitrogen rates (0; 75; 150; 225 and 300 kg ha-1), used as parameters to estimate biologically fixed nitrogen. The concentration of nutrients was determined in samples of cuts, performed at 56, 84 and 112 days after emergence. The effects of nitrogen fertilization were evaluated by regression analysis, with results demonstrating that the levels of N, Mg and S increase and those of P decrease linearly as a function of the applied rates. Inoculation improves the nutritional status of plants, increasing the foliar contents of N, P, K, resulting in higher production of dry biomass, in addition to reducing the need for nitrogen application by up to 40 kg ha-1.