Atividade residual de (imazethapyr+imazapic) sobre azevém anual (Lolium multiflorum), semeado em sucessão ao arroz irrigado, sistema clearfield®

Pinto, J.J.O.; Noldin, José Alberto; Rosenthal, Mariane D’Avila; Pinho, Camila Ferreira de; Rossi, F.; Machado, Ângela Aparecida; Piveta, Leonard B.; Galon, Leandro

doi:10.1590/s0100-83582009000300023

Cited by 26 publications

(32 citation statements)

References 22 publications

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“…In contrast, a dry matter reduction in all soil profile thicknesses occurred (Figure 2), which shows the herbicide carryover to ryegrass plants. These results are similar to those reported by Pinto et al (2009a), who found that imazethapyr + imazapic, applied at a 1.0 L ha -1 in post-emergence irrigated rice, remains active in the soil to significantly reduce the plant's aboveground dry height, its biological yield and the germination potential of ryegrass seed sown in rotation, after a year of CL rice cultivation. In contrast, Grohs et al (2008) showed no carryover effect on ryegrass emergence, and shoot dry weight.…”

Section: Resultssupporting

confidence: 90%

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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: Resultssupporting

confidence: 90%

“…Nevertheless, it may be adversely be affected by the herbicide residues in soil. Studies show that ryegrass seeds have reduced growth as well as dry matter when grown in imidazolinone treated areas (Pinto et al, 2009a).…”

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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“…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%

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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“…This herbicide is characterized by long persistence in soil and show effect in dicotyledonous and monocotyledon, which reduces the number of applications, however, has reported cases of phytointoxication. Pinto et al (2009) when evaluating the application of a mixture of herbicides (imazethapyr + imazapic) in ryegrass culture in succession to irrigated rice, observed a phytotoxic effect of this mix, resulting in smaller plants, requiring a range of 180 days from the application until the sowing of the next crop, due to the possibility of this effect persist in soil for a long time, depending on the environment.…”

Section: Introductionmentioning

confidence: 99%

Residual effect of pre-emergent herbicides on the initial development and biochemical composition of snap bean seedlings

et al. 2017

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-The use of herbicides must be made in a rational way, giving priority to reduce possible adverse effects on subsequent crops. The objective was to evaluate the residual effect of pre-emergent herbicides on growth and initial development as well as the biochemical composition of snap bean seedlings. The experimental design used was the completely randomized, with four replications in factorial scheme 3x4, three snap bean cultivars (Macarrão Favorito, Macarrão Preferido e Macarrão Trepador) and three pre-emergent herbicides, plus a control (without herbicide). Was use the residual doses of pre-emergent herbicides sulfentrazone in 0.3 g ha -1 , diclosulam in the concentrations of 0.126 g ha -1 and imazethapyr in 0.05 g ha -1 . The work was developed in a seeds analyze laboratory with the purpose of minimizing possible adverse effects of the environment. The seeds were sowing on germitest paper moistened with solutions containing the herbicides, with each respective treatment. The following characteristics were evaluated: germination (GER), germination speed index (GSI), seedling length (SL) and seedling dry mass (SDM) and soluble protein content (PROT) in addition to the enzymatic activity of catalase (CAT), peroxidase (PER) and phenylalanine ammonia-lyase (PAL). The phytometric variables SL, SDM, GER and GSI reduced in the presence of herbicides, and for the levels of PROT and enzymatic activity of CAT, PER and PAL there was observed a variation according to the genotype. The sulfentrazone showed up as the product of higher toxicity, as well as the Macarrão Trepador as the genotype with lower tolerance.

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Atividade residual de (imazethapyr+imazapic) sobre azevém anual (Lolium multiflorum), semeado em sucessão ao arroz irrigado, sistema clearfield®

Cited by 26 publications

References 22 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

Residual effect of pre-emergent herbicides on the initial development and biochemical composition of snap bean seedlings

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