Desempenho agronômico da soja pelo manejo de Glyphosate e da co-inoculação

• Ano de defesa: 2019
• Autor(a) principal: Ferreira, Matheus Martins
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; Agronomia; UFSM; Programa de Pós-Graduação em Agronomia; Centro de Ciências Rurais
• Palavras-chave em Português: Controle químico; Bactérias diazotróficos; Fixação biológica; Glycine max (L.); Chemical control; Diazotrophic bacteria; Biological fixation; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://repositorio.ufsm.br/handle/1/19652

The economically viable production of soybean is dependent on the efficiency of biological nitrogen fixation. The objective of this research was to evaluate the management of ghyphosate and co-inoculation in soybean agronomic performance. Three experiments were carried out, two in the field and one in greenhouse. The experiments in the field were done in randomized blocks distributed in a 3x5 factorial with four replications in two sowing seasons. The first factor consisted of three inoculation combinations: (i) co-inoculation; (ii) inoculation; (iii) without inoculation. The second factor was composed of a control and four forms of weed management with the herbicide glyphosate: (i) - weed control without application of glyphosate, (ii) - a post-emergence application, (iii) - desiccation 10 days (v) - desiccation 10 days before sowing + two post-emergence applications, (iv) - two post-emergence applications. The greenhouse experiment was conducted in a completely randomized design distributed in a 2x5 factorial with four replicates. The first factor was composed of two inoculation combinations: (i) co-inoculation, (ii) inoculation. The second factor was composed of four glyphosate salts: (i) isopropylamine salt, (ii) ammonium salt, (iii) potassium salt, (iv) Di-ammonium salt and (v) a control without application of glyphosate. In the field were evaluated the number and mass of the nodules per plant, grain yield and the mass of 1000 grains. In the greenhouse were evaluated the number and mass of the nodules per plant, the dry weight of shoot and root and the herbicide phytotoxicity. Managements with glyphosate reduced soybean nodules, but with no effect on crop yield. Co-inoculation did not increase nodulation and soybean yield under field conditions, however, increased nodulation in a controlled environment.