Tecnologia de aplicação de bioinsumos em sulco de semeadura

• Ano de defesa: 2025
• Autor(a) principal: Aita, Lorenzo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; UFSM; Programa de Pós-Graduação em Engenharia Agrícola; Centro de Ciências Rurais
• Palavras-chave em Português: Temperatura de calda; Viabilidade de micro-organismos; Volume de calda por hectare; Resíduo nos filtros; Obstrução de pontas de pulverização; Spray solution temperature; Micro-organism viability; Spray volume per hectare; Residue in filters; Spray nozzle clogging; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA
• Link de acesso: http://repositorio.ufsm.br/handle/1/36852

The use of bioproducts in Brazilian agriculture has shown significant growth, driven by positive outcomes such as increased crop productivity, reduced costs, and improved pest and disease control efficiency. Many bioproducts require placement near the seed, where in-furrow spraying has emerged as an effective alternative, facilitating microorganism establishment due to the possibility of using larger volumes of water compared to seed inoculation. The effectiveness of bioproducts is directly linked to the survival of microorganisms during the inoculation process, with temperature being a key factor. Likewise, the spray solution volume influences microbial effectiveness, product solubility, and the operational capacity of the seeder furrow sprayer system. This dissertation comprises two chapters: the first evaluates the viability of microorganisms under different spray solution temperatures applied in the planting furrow; the second assesses the influence of spray volumes of 20, 35, and 50 L/ha for the application of liquid and wettable powder formulations. The experiments were conducted at the Integrated Pest Management Laboratory of UFSM, using three furrow sprayers with 100 liter tanks and the microorganisms Bradyrhizobium japonicum, Azospirillum brasilense, and Trichoderma harzianum. Microbial viability was assessed by colony formation on Petri dishes incubated in a B.O.D. chamber. The results indicate that microbial viability depends on the temperature of the spray solution and the duration of exposure to that temperature; that spray solution temperature is influenced by ambient conditions even in thermally insulated tanks; and that liquid formulations show no restrictions regarding spray volume or filter type, whereas wettable powder formulations require mesh 50 inline filters and spray volumes of 35 L/ha.