Abstract
The experiment was carried out in Cascavel, Parana State, using the soybean cultivar CD 202, with the objective of evaluating the amount of spraying suspension deposited on soybean leaves. Samples were collected containing 15 leaves per plot in five plants in different extracts - one leaf of the lower extract, one of the medium and one of the upper extract - with the objective of evaluating the amount of suspension deposited in function of flow and nozzle type. The treatments were constituted of four spraying nozzles (simple fan, double fan, double fan with air injection and empty cone) and three suspension volumes (100, 200 and 300 L ha -1 ). The suspension volume that presented the highest depositions in the different extracts of the soybean plants was 300 L ha -1 ; the spraying nozzle that presented the highest depositions, in the upper plant extract was the double plane jet; for the medium and lower extracts, the jet empty cone nozzle. The depositions in middle and lower thirds of the soybean plants were significantly lower to those obtained in the upper third, regardless of the nozzle and flow used; for higher depositions in the upper third of soybean plants, the best combination is to use double plane jet nozzles, with suspension volumes of 300 L ha -1 ; for higher depositions in the medium and lower third of soybean plants, the best combination is to use conical jet nozzles, with suspension volumes of 200 or 300 L ha -1
Highlights
O principal objetivo da aplicação de produtos fitossanitários na agricultura é o de eliminar ou controlar as pragas, as doenças, as plantas daninhas ou outros agentes prejudiciais às culturas
724 0,76 Muito fina com a finalidade de avaliar a deposição da calda, de acordo com a vazão e os diferentes bicos
Para a obtenção da concentração do corante, na amostra em mg L-1, foi construída uma curva de calibração, efetuando-se a leitura no espectrofotômetro, de concentrações conhecidas do corante (Figura 3)
Summary
O experimento foi conduzido no ano agrícola 2004/2005, em área pertencente à Cooperativa Agroindustrial de Cascavel - Coopavel, município de Cascavel, Estado do Paraná, localizada na BR 277, km 577, com altitude média de 760 metros, latitude 24o 57’ 30’’ S e longitude 53o 28’ 30’’ W. O delineamento experimental utilizado foi blocos ao acaso, em arranjo fatorial três volumes (100; 200 e 300 L ha-1) e quatro bicos de pulverização (leque simples; duplo leque; duplo leque com injeção de ar e cone vazio), totalizando 12 tratamentos com quatro repetições, em parcelas de 3,0 x 6,0 m (18 m2), totalizando 864 m2 de área experimental. Com base nas características químicas apresentadas na análise de solo (Tabela 1), a adubação utilizada, na área experimental, foi de 245 kg ha-1 do adubo formulado 00-20-25. Quando da aplicação dos tratamentos, as condições climáticas eram: temperatura de 26oC, umidade relativa do ar de 59% e velocidade dos ventos de 6 a 7 km por hora, condições adequadas para a realização da pulverização. As vazões e as pressões utilizadas variaram de acordo com o tipo de bico utilizado (Tabela 2).
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