Deposição de glyphosate aplicado para controle de plantas daninhas em soja transgênica
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Data
2006-01-01
Autores
Gazziero, D.L.P.
Maciel, C.D.G. [UNESP]
Souza, R.T. [UNESP]
Velini, Edivaldo Domingues [UNESP]
Prete, C.E.C.
Oliveira Neto, W.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
Inúmeros fatores estão envolvidos na tecnologia de aplicação de um herbicida, sendo a deposição correta fundamental para que o produto possa expressar sua eficiência. Com o objetivo de avaliar a deposição de uma solução traçante constituída de glyphosate Roundup Ready (0,96 kg e.a. ha-1) + corante FDC-1 (1.500 ppm), foi conduzido um experimento em área semeada com soja transgênica e infestada com amendoim-bravo (Euphorbia heterophylla), localizada em Londrina-PR. As aplicações foram efetuadas em diferentes estádios de desenvolvimento da cultura, correspondendo a 17, 24, 31, 38 e 45 dias após a emergência da soja. Os alvos, plantas de soja, amendoim-bravo e placas na superfície do solo (linha e entrelinha), foram coletados após pulverização, e a solução traçante foi nestes depositada, posteriormente recuperada através de lavagem com agitação em água destilada. As amostras das soluções recuperadas foram submetidas à análise, utilizando-se procedimentos espectrofotométricos, e os resultados de absorbância convertidos para concentração em µL cm-2 e µL por planta. As freqüências acumuladas dos dados originais de depósito foram adequadamente ajustadas segundo modelo de Gompertz, apresentando elevada precisão (R² > 0,95). Os resultados indicaram que o depósito da calda de pulverização nas plantas de soja e amendoim-bravo reduziu progressivamente com o desenvolvimento da cultura e infestação, sugerindo que a maior garantia de eficiência de controle pode ser conseguida com aplicações precoces.
Several factors are involved in herbicide application technology, with correct deposition being essential to ensure product efficacy. To evaluate the deposition of a glyphosate tracer solution (RR) with an FDC-1 dye, an experiment was carried out in a transgenic soybean cultivated area, infested with wild poinsettia (Euphorbia heterophylla). Applications were carried out at different crop development stages, corresponding to 17; 24; 31; 38 and 45 days after soybean emergence. The targets, soybean plants, wild poinsettias, and Petri dishes on the soil surface, were collected after spraying and the tracer solution was later recovered by washing and stirring in distilled water. Samples of recovered solutions were submitted to spectrophotometer analysis, and the absorption data were converted in µL cm-2 and µL per plant. The accumulated frequencies of the original deposit data were adequately adjusted to the Gompertz model, showing high precision (R² > 0.95). The results showed that the spraying solution deposition on soybean plants and wild poinsettia reduced progressively with crop development and weed infestation, suggesting that control efficiency can be obtained with early applications.
Several factors are involved in herbicide application technology, with correct deposition being essential to ensure product efficacy. To evaluate the deposition of a glyphosate tracer solution (RR) with an FDC-1 dye, an experiment was carried out in a transgenic soybean cultivated area, infested with wild poinsettia (Euphorbia heterophylla). Applications were carried out at different crop development stages, corresponding to 17; 24; 31; 38 and 45 days after soybean emergence. The targets, soybean plants, wild poinsettias, and Petri dishes on the soil surface, were collected after spraying and the tracer solution was later recovered by washing and stirring in distilled water. Samples of recovered solutions were submitted to spectrophotometer analysis, and the absorption data were converted in µL cm-2 and µL per plant. The accumulated frequencies of the original deposit data were adequately adjusted to the Gompertz model, showing high precision (R² > 0.95). The results showed that the spraying solution deposition on soybean plants and wild poinsettia reduced progressively with crop development and weed infestation, suggesting that control efficiency can be obtained with early applications.
Descrição
Palavras-chave
Roundup Ready, traçante (Blue Brilhant), soja transgênica, Roundup Ready, tracer (Brilliant Blue), transgenic soybean
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 24, n. 1, p. 173-181, 2006.