Transporte ascendente da mistura formulada de imazethapyr e imazapic em resposta à profundidade do lençol freático

Bundt, Angela Da Cas; Avila, Luis Antônio de; Pinto, Jesus de Oliveira Faculdade de Agronomia Eliseu Maciel Juares; Santos, Tiago Torres dos; Agostinetto, Dirceu; Martins, Karen Faculdade de Agronomia Eliseu Maciel

doi:10.1590/s0103-84782013005000111

Cited by 6 publications

(4 citation statements)

References 17 publications

(19 reference statements)

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“…These herbicides can move upwardly along the soil profile, according to the water table oscillations (Van Wyk & Reinahardt, 2001;Firmino et al, 2008;Bundt, 2013). Therefore, the herbicide located in greater depth may return to the soil surface, during the period after rice harvest, causing damage to crops sown in succession and/ or rotation.…”

Section: Podem Persistir No Ambiente E Causar Danos àS Culturas Não Tmentioning

confidence: 99%

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

et al. 2015

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-Herbicides used in Clearfield ® rice system may persist in the environment, damaging non-tolerant crops sown in succession and/or rotation. These damages vary according to soil characteristics, climate and soil management. The thickness of the soil profile may affect carryover effect; deeper soils may allow these molecules to leach, reaching areas below the roots absorption zone. The aim of this study was to evaluate the effect of the thickness of soil profile in the carryover of imazethapyr + imazapic on ryegrass and nontolerant rice, sown in succession and rotation to rice, respectively. Lysimeters of different thicknesses (15, 20, 30, 40, 50 and 65 cm) were constructed, where 1 L ha -1 of the imazethapyr + imazapic formulated mixture was applied in tolerant rice. Firstly, imidazolinone-tolerant rice was planted, followed by ryegrass and non-tolerant rice in succession and rotation, respectively. Herbicide injury, height reduction and dry weight of non-tolerant species were assessed. There was no visual symptoms of herbicide injury on ryegrass sown 128 days after the herbicide application; however it causes dry weight mass reduction of plants. The herbicides persist in the soil and cause injury in non-tolerant rice, sown 280 days after application, and the deeper the soil profile, the lower the herbicides injury on irrigated rice.Keywords: degradation, imidazolinone, Lolium multiflorum, leaching, Oryza sativa. (15, 20, 30, 40, 50 RESUMO -Os herbicidas usados na cultura do arroz

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Section: Podem Persistir No Ambiente E Causar Danos àS Culturas Não Tmentioning

confidence: 99%

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

et al. 2015

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“…This result may be related to the climatic conditions caused by a lower volume of rain and higher temperature during the second year of the experiment in the field. Especially under conditions of high evaporation (FIRMINO et al, 2008), capillary movement of water moving upwardly the imidazolinone herbicides in soil (BUNDT et al, 2013), which keeps the herbicide near the soil surface in periods of rain shortage may occur. Herbicides that were once in the upper layers, are subject to further degradation by the decomposing microorganisms.…”

Section: Resultsmentioning

confidence: 99%

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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“…Tais herbicidas podem movimentar-se ascendentemente ao longo do perfi l, de acordo com as oscilações do lençol freático (FIRMINO et al, 2008;BUNDT, 2013), sendo essa uma das possíveis explicações para os problemas de efeito residual do herbicida em condições de solo de cultivo de arroz, ou seja, o retorno para a superfície do solo durante a entressafra, após o mesmo ter lixiviado no período de cultivo do arroz.…”

Section: Os Herbicidas Utilizados No Sistema Clearfi Eld ® De Produçãunclassified

Lixiviação de imidazolinonas em resposta a diferentes manejos de irrigação em solo de cultivo de arroz irrigado

et al. 2014

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Transporte ascendente da mistura formulada de imazethapyr e imazapic em resposta à profundidade do lençol freático

Abstract: RESUMO Os herbicidas usados na cultura do arroz

Cited by 6 publications

References 17 publications

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

Leaching and residual activity of imidazolinone herbicides in lowland soils

Lixiviação de imidazolinonas em resposta a diferentes manejos de irrigação em solo de cultivo de arroz irrigado

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