Distribuição espacial da deriva de produtos fitossanitários em pulverizações na cultura da laranja

• Ano de defesa: 2015
• Autor(a) principal: Pita, Javier Dias [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Laranja; Pulverização; Produtos químicos agrícolas - Aplicação; Defensivos vegetais; Produtos químicos agrícolas; Spraying
• Link de acesso: http://hdl.handle.net/11449/132173; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/09-12-2015/000855287.pdf

The application technology for plant protection search the correct product placement on target, if needed, in the required amount, cost-effectively and with minimal human and environmental contamination, reducing production costs and maintaining a sustainable relationship between agriculture and environment. The aim of this study was the evaluation of spatial distribution of spray drift due to plant protection products (ppp) applications in different weather conditions and working pressures on orange crop. Two citrus (Citrus sinensis) areas were used, located in CITROPAR company (Citricos of Para SA). For sampling, nylon yarn collectors were distributed in the area, georeferenced and sent to laboratory for analysis after the applications. For droplet spectrum analysis the following parameters were estimated: volumetric median diameter (VMD), uniformity coefficient (Coef.) and percentage of droplets smaller than 100 micrometers, calculated by laser diffraction for particle size analysis. To represent the spatial distribution of spray drift, interpolation maps were built by the inverse distance-squared method (IDS), taking into account the amount of marker on deposit collectors (ug) and the range (m). The weather conditions have a direct influence on spray drift, with wind speed and direction being the most important factors, influenced by working pressure in the sprayer's hydraulic circuit. Work pressures also influenced the droplets spectrum for the used nozzle in both swirl plates, and spraying under lower pressure shows less potential risk of drift