Lixiviação do imazethapyr em solo de várzea sob dois sistemas de manejo

Kraemer, A.F.; Marchesan, Enio; Grohs, Mara; Avila, Luis Antônio de; Machado, Sérgio Luiz de Oliveira; Zanella, Renato; Massoni, Paulo Fabrício Sachet; Sartori, Gerson Meneghetti Sarzi

doi:10.1590/s0103-84782009005000119

Cited by 15 publications

(19 citation statements)

References 22 publications

(9 reference statements)

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“…These data corroborated those obtained by KRAEMER et al (2009), who reported imazethapyr at a depth of 20cm. BUNDT et al (2014) observed imidazolinones leaching at depths up to 40cm.…”

Section: Resultssupporting

confidence: 92%

“…These variations in the lower layers may not have been caused by the action of herbicides, but by reason of the measuring scale used. These results corroborated those obtained by KRAEMER et al (2009) who observed a decrease in the treated plants' height.…”

Section: Resultssupporting

confidence: 92%

“…Residual activity of these herbicides in the soil may manifest itself in subsequent crops in the form of phytotoxicity (KRAEMER et al, 2009), decrease in height (PINTO et al, 2009) and plant death. Allied to this, the increase in the dose of these herbicides promoted by the use of rice cultivars with higher levels of tolerance can exacerbate the problem of residual soil.…”

Section: Crop Protectionmentioning

confidence: 99%

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Leaching and residual activity of imidazolinone herbicides in lowland soils

et al. 2017

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Herbicides used in the Clearfield® rice (Oryza sativa L.) production system have a potential for leaching. This can result in contamination of underground water resources and cause injury to not tolerant crops that are sown in a succession and/or crop rotation. The objective of this study was to determine the leaching potential and the residual activity of the herbicides used in the Clearfield® rice system. The experiment was conducted over a period of two years and consisted of conducting a field test to be followed by two bioassays with a year of difference between their implementation. Initially an experiment was conducted in lowland area where it was planted the cultivar of rice ‘PUITA INTA CL’. Approximately one and two years thereafter, soil samples from each plot were collected at intervals of 5cm to a depth of 30cm (B factor) for the bioassay to evaluate persistence of herbicides. Factor A was composed of mixtures formulated of imazethapyr + imazapic (75 + 25g a.i. L-1), imazapyr + imazapic (525 + 175g a.i. kg-1) in two doses, imazethapyr (100g a.i. L-1) and treatment control without application. Basing on results, it was concluded that the mixtures imazethapyr + imazapic, imazapyr + imazapic and imazethapyr leached into the soil, reaching depths of up to 25cm in lowland soil. Imidazolinone herbicides used today in the irrigated rice Clearfield® system are persistent in soil, and their phytotoxic activity can be observed up to two years after application.

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“…These data corroborated those obtained by KRAEMER et al (2009), who reported imazethapyr at a depth of 20cm. BUNDT et al (2014) observed imidazolinones leaching at depths up to 40cm.…”

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

Section: Crop Protectionmentioning

confidence: 99%

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Leaching and residual activity of imidazolinone herbicides in lowland soils

et al. 2017

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“…Em relação à fitotoxicidade em genótipos de arroz irrigado não resistentes, existem contradições quanto aos resultados encontrados por diferentes autores (VILLA et al, 2006;KRAEMER et al, 2009;MARCHESAN et al, 2010), as quais podem ser explicadas por diversos fatores, como aqueles relacionados ao manejo da lavoura (KRAEMER et al, 2009), à textura do solo e à precipitação pluvial e/ou irrigação. Esses fatores influenciam diretamente a mobilidade do herbicida no perfil do solo, sendo este um aspecto importante na disponibilidade do herbicida para as plantas.…”

Section: Introductionunclassified

“…Esses fatores influenciam diretamente a mobilidade do herbicida no perfil do solo, sendo este um aspecto importante na disponibilidade do herbicida para as plantas. Resultados de pesquisas demonstraram que, após um ano da aplicação de imazetapir, a maior concentração do herbicida foi observada até 20cm de profundidade em solo de várzea com 2,3% de matéria orgânica e 26% de argila (KRAEMER et al, 2009) ou 40cm após três anos de cultivos (HOLLAWAY et al, 2006).…”

Section: Introductionunclassified