Navegando por Autor "Oliveira, João Victor de"

Agora exibindo 1 - 1 de 1
  • Imagem de Miniatura
    Dissertação
    Acesso aberto (Open Access)
    Adição de diferentes classes de adjuvantes nas aplicações do herbicida glufosinato
    (Universidade Estadual do Norte do Paraná, 2021-07-09) Oliveira, João Victor de; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Gandolfo, Marco Antônio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Kruger, Greg R.; https://orcid.org/0000-0002-8975-0507
    The percentage of area treated with glufosinate is low, mainly due to weed control inconsistencies. Adjuvants can assist in the use of glufosinate for technologies of resistant crops and favor decreases in the probability of resistance evolution. The objective of this work was to evaluate the effect of adding adjuvants of different chemical and physical constitutions on the performance of glufosinate herbicide. In the first chapter, the objective was to determine the effect of adding adjuvants on the physical and chemical properties and the droplet spectrum in glufosinate applications. In the second chapter, the objective was to evaluate the effect of adding adjuvants to glufosinate on the control and contact angle on different weed species at two developmental stages. Laboratory and greenhouse analyses were carried out to evaluate physical and chemical properties (density, dynamic viscosity, surface tension, electrical conductivity, and pH) of solutions and to determine droplet spectrum parameters: droplet diameter at 10%, 50%, and 90% of the total volume applied (Dv0.1, Dv0.5, and Dv0.9), relative amplitude, and percentage of volume of droplets smaller than 100 and 150 μm (V100 and V150). Weed control was carried out at two developmental stages (15 ± 3 cm and 27 ± 3 cm) of six weed species (velvetleaf, kochia, waterhemp, common lambsquarters, barnyardgrass, and green foxtail). The addition of adjuvants resulted in variations in the spray solutions for all evaluated parameters. The presence of adjuvants resulted in higher variations for viscosity than for density. The addition of the drift-reducing adjuvant resulted in higher viscosity and better droplet spectrum characteristics to reduce drift (> Dv0.5, < V100, and < V150). Weed control and contact angle varied according to the weed species, adjuvant class, and developmental stage. The contact angle is dependent on the weed species, spray solution, and leaf position on the plant.