ABSTRACT:The aim of this study was to evaluate different spray nozzles for land applications in high speed on the coverage and deposit in soybean plants pulverization. It was evaluated the AXI 110 04 plane jet nozzles operated at speed of 4.17m.s -1 (control), the grey APE and the AXI 110 08 plane jets, and the TD HiSpeed 110 06 and AXI TWIN 120 06 twin jets, at speed of 9.72m.s -1 . The application volume was fixed in 120L ha -1 . The application efficiency was evaluated by two different methods: analysis of the coverage area using fluorescent pigment and UV light and analysis of deposits through the recovery and quantification of FD&C N°1 brilliant blue marker by spectrophotometry. Both analyses were done in samples collected from top, middle and bottom parts of the plants. The spray nozzles showed differences in coverage and deposit pattern, so in the top part, the coverage was increased with smaller drops and the deposits were increased with medium drops. In the other parts of the plants, there were no statistical differences between the treatments for both coverage and deposits. The displacement speed did not influence the application efficiency for nozzles with the same drop pattern, and the obtained spray coverage and deposits at the medium and bottom parts of the plants were less than 50% of that found at the top of the soybean plants. KEYWORDS:Spray nozzles, speed, soybean, pulverizer. DESEMPENHO DE PONTAS DE PULVERIZAÇÃO EM APLICAÇÕES TERRESTRESCOM ALTA VELOCIDADE RESUMO: O objetivo do trabalho foi avaliar o efeito de diferentes pontas de pulverização para aplicações terrestres em alta velocidade sobre a cobertura e depósito da pulverização em plantas de soja. Foram avaliadas as pontas de jatos planos AXI 110 04 à velocidade de 4,17 m.s -1 (testemunha), de jatos planos APE cinza e AXI 110 08, e de jatos planos duplos TD HiSpeed 110 06 e AXI TWIN 120 06, à velocidade de deslocamento de 9,72 m.s -1 . O volume de aplicação foi fixado em 120 L.ha -1 . A eficiência de aplicação foi avaliada por dois métodos: análise visual do percentual de cobertura, utilizando marcador fluorescente e com luz ultravioleta, e análise de depósito através da recuperação e da quantificação do marcador Azul Brilhante FD&C N°1 por espectrofotometria. Ambas as análises foram realizadas em amostras retiradas das partes superior, média e inferior das plantas. As pontas de pulverização mostraram padrões de cobertura e depósito diferenciados, de modo que, na parte superior, a cobertura foi favorecida por gotas mais finas e o depósito melhorado pelo uso de gotas médias. Nas demais partes da planta, não houve diferença estatística entre os tratamentos para cobertura e depósito. A velocidade de deslocamento não interferiu na eficiência da aplicação para pontas com o mesmo padrão de gota, sendo os níveis dos depósitos e da cobertura nos terços inferior e médio inferiores a 50% dos obtidos na parte superior das plantas. PALAVRAS-CHAVE:Bicos, velocidade, soja, pulverizador.Performance of spray nozzles in land applications with high speed Eng.
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