Deposition and leaching of tebuthiuron on sugar cane straw applied with and without alkyl polyglycoside adjuvant

• Autor(a) principal: Negrisoli, Eduardo [UNESP]
• Data de Publicação: 2005
• Outros Autores: Da Costa, Eduardo Antonio Drolhe, Velini, Edivaldo Domingues [UNESP], Cavenaghi, Anderson Luis [UNESP], Tofoli, Gustavo Radomille [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.tandfonline.com/doi/full/10.1081/PFC-200034329#.Uv4tF4VGnIU; http://hdl.handle.net/11449/68117
• topic: APG adjuvant; Herbicide; Rain simulation; Sugar cane straw; Tebuthiuron; Concentration (process); Deposition; Herbicides; Leaching; Liquid chromatography; Straw; Alkyl polyglycoside adjuvant (APG); Herbicide retention; Sugar cane; glycoside; rain; tebuthiuron; deposition; herbicide; leaching; sugar cane; conference paper; controlled study; high performance liquid chromatography; nonhuman; precipitation; simulation; straw; sugarcane; Chromatography, High Pressure Liquid; Environmental Pollution; Glycosides; Methylurea Compounds; Rain; Saccharum; Soil Pollutants; Solubility; Water Pollutants; Concentration; Sugar Cane; Arundinaria; Saccharum hybrid cultivar

A laboratory experiment was carried out aiming to study the effects of an alkyl polyglycoside adjuvant (APG) on deposition and leaching of the herbicide tebuthiuron applied on sugar cane straw. Tebuthiuron, at concentration of 1200 mg L-1, was applied separately and in tank mix with the APG adjuvant, at concentrations of 0.07 and 0.09% (wt v-1), using a spraying volume of 204 L ha-1. A precipitation equivalent to 20 mm of rain was simulated, 24 h after the applications, to evaluate the herbicide leaching. The quantification of tebuthiuron was carried out by the high performance liquid chromatography (HPLC). It was observed that the addition of APG adjuvant at 0.07% (wt v-1) provided an increase of 11.5% in the deposition of tebuthiuron on straw, reduction of 50.4% in the drift of the herbicide and it did not affect significantly the leached amount (68.5%), when compared with the treatment where tebuthiuron was applied alone (70.8%). At the concentration of 0.09% (wt v-1), the APG adjuvant caused an increase of 22.7% in the deposition; it reduced the drift of the herbicide by 99.9% and reduced the leached amount by 7.6% thereby increasing the retention of the herbicide by straw.