title: Deposition and leaching of tebuthiuron on sugar cane straw applied with and without alkyl polyglycoside adjuvant.
abstract: 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.
authors.affiliation: Faculdade de Agronomia da Universidade do Estado de São Paulo, UNESP/Botucatu, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Negrisoli
authors.forename: Eduardo Antonio Drolhe
authors.initials: EA
authors.lastname: da Costa
authors.forename: Edivaldo Domingues
authors.initials: ED
authors.lastname: Velini
authors.forename: Anderson Luis
authors.initials: AL
authors.lastname: Cavenaghi
authors.forename: Gustavo Radomille
authors.initials: GR
authors.lastname: Tofoli
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004787:Environmental Pollution / Q000517:prevention & control; D006027:Glycosides / Q000737:chemistry; D006540:Herbicides / Q000032:analysis / Q000737:chemistry*; D008782:Methylurea Compounds / Q000032:analysis / Q000737:chemistry*; D011891:Rain; D031786:Saccharum / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis; D012995:Solubility; D014873:Water Pollutants / Q000032:analysis
chemical_list: D006027:Glycosides; D006540:Herbicides; D008782:Methylurea Compounds; D012989:Soil Pollutants; D014873:Water Pollutants; C010346:tebuthiuron