Eficácia do herbicida flumioxazin no controle de Euphorbia heterophylla, na aplicação sobre diferentes tipos de palha e simulações de chuva

Silva, Paulo Vinícius da; Tronquini, Sergio Mateus; Barbosa, Gustavo César; Dias, Rodrigo Gonçalves; Veiga, João Paulo Soto; Júnior, Edmundo Inácio

doi:10.19084/rca.20815

Cited by 4 publications

(5 citation statements)

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“…The work solutions were composed of 14 C-diclosulam herbicides with the specific activity of 2.55 MBq mg −1 and 14 C-diuron with the specific activity of 5.74 × 10 3 MBq mg −1 , both with radiochemical purity above 95%, as recommended by [37] OECD (2000). Technical herbicides (diclosulam and diuron) were also used to adjust the dose to the equivalent to the recommended field-level dose (purity > 95%).…”

Section: Test Substancesmentioning

confidence: 99%

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Cover Crop Straw Interferes in the Retention and Availability of Diclosulam and Diuron in the Environment

et al. 2023

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Pre-emergent herbicides are applied directly in the soil or over the straw in no-till systems and can be retained, reducing the product’s availability. The current study characterizes the retention of diclosulam and diuron in forage turnip (FT), buckwheat (BW), and black oat (BO) straws. Radiometric techniques evaluated the sorption–desorption and leaching processes. Spectroscopic and microscopic methods characterized chemical and morphological alterations in the straw. Sorption rates (Kf) of diclosulam and diuron followed the order BO > BW > FT. Irreversible sorption (hysteresis < 0.7) occurs to diclosulam applied to BO straw. The BO straw showed porous structures, indicating physical entrapment of the herbicides. Straw fragments (<1 mm) increased the sorption of herbicides. The increase in straw amount (2.5 to 5 t ha−1) reduced herbicide leaching to 18.8%. Interactions between chemical groups (C-Cl, C-F, and C-N) from herbicides with straw characterize a chemical barrier. The present research suggests that entrapment and chemical interaction are involved in the sorption–desorption process of herbicides, such as diclosulam and diuron, in the straw matrix, directly interfering with their availability in the environment. This process can reduce the herbicide environmental risk but can decrease weed control efficiency.

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Section: Test Substancesmentioning

confidence: 99%

“…Parameters of sorption-desorption isotherms of14 C-diclosulam and14 C-diuron based on the Freundlich model. Data indicates parameter value ± standard error of the mean (n = 2).…”

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confidence: 99%

Cover Crop Straw Interferes in the Retention and Availability of Diclosulam and Diuron in the Environment

et al. 2023

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“…The herbicide action dynamics can change due to precipitation conditions, however, there was no observation of the negative influence of cover on the chemical control of weeds, since there were no water limitations after the application of the herbicides in this work. An accumulated precipitation of 18 mm was observed up to five days after application (Figure 7), enough to reduce the possibilities of adsorption of molecules on the straw and facilitate the concentration of the herbicide in the solution (Clark et al, 2019;Da Silva et al, 2020).…”

Section: Weed Controlmentioning

confidence: 99%

“…The cover straw cultivated in the off season promotes soil shading and contributes to the reduction of weed species germination, on the other hand, this physical barrier can also reduce the efficiency of herbicides, since they have solubility characteristics that depend on a certain amount of water to break the straw and reach the ground (Da Silva et al, 2020). Higher straw densities can mitigate herbicide transposition, increasing the possibility of degradation (Fornarolli, Rodrigues, Lima, & Valério, 1998;Reddy et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Residual Herbicides and Cover Crops Interactions for Soybean Weed Control

Roncatto¹,

Barroso²,

Novello³

et al. 2022

JAS

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Residual herbicides and cover crops are important tools inside an integrated weed management program. The straw produced in crop rotation can interacts with herbicides. The aim of this study was to evaluate the interaction of diclosulam, sulfentrazone, imazethapyr, flumioxazin, s-metolachlor and pyroxasulfone with black oat, cereal rye, common vetch and oilseed radish cover crops and it´s reflection on weed control and soybean production. Were evaluated the biomass production of cover crops and its influence on the soybean population. A phytosociological survey of the weed community was carried out, further evaluating the control provided by the herbicides and its effects on soybean productivity. Diclosulam was the more efficient herbicide tested, reducing both weed density and biomass (68% and 89%, respectively) compared to the fallow, independently of cover crop straw. The best control levels for the population identified were provided by the combination of the herbicides diclosulam with black oat, radish or fallow. We observed that herbicide efficacy in this case was more related with control spectrum than with herbicide-straw interation. This research demonstrates that the integration of cover crops and residual herbicides is efficient in the suppression and control of weeds in the soybean crop in the no-tillage system.

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“…Rain is essential for the herbicide to pass through the straw and reach the soil solution [33], but in dry conditions, these products are retained and adsorbed to the straw, which reduces weed control [34,35]. Thus, the efficiency of pre-emergent herbicides applied under straw depends on the product's characteristics, the nature and amount of straw in the soil, and the occurrence of rainfall [10].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw

Duque,

Oliveira,

Souza

et al. 2023

Forests

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The occurrence of weeds in eucalyptus plantations can cause losses in productivity. Chemical control is widely used, but the efficiency of herbicides depends on management and environmental factors. This study aims to evaluate the efficiency of S-metolachlor + glyphosate in the control of grasses in different densities of eucalyptus straw and with simulated rainfall after application of the product. The experiment was conducted in a randomized block design, factorial, with four replications. The first factor represented 0; 1.06 + 0.79 e 2.12 + 1.59 kg i.a. ha−1 of the commercial dose of S-metolachlor + glyphosate, the second 0; 5 and 10 tons ha−1 of straw and, the third 25 and 50 mm of water depth applied in soil with a mix of grasses previously sowed. The evaluations carried out were fresh mass, dry mass, and visual analysis of the control percentage. The fresh and dry mass and the grasses’ dry mass/water ratio decreased with increasing herbicide dosage and straw density. The treatments without straw and with the herbicide application had the highest percentages of control, the highest in the dosage of 2.12 + 1.59 kg i.a. ha−1 of S-metolachlor + glyphosate. Applying different water depths (25 mm or 50 mm) did not influence the control. In conclusion, it was observed that the isolated straw promoted the control of grasses. However, in treatments that included straw and herbicide, there was a decrease in the efficiency of the product, which suggests an antagonism between the vegetation cover and S-metolachlor + glyphosate.

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Eficácia do herbicida flumioxazin no controle de Euphorbia heterophylla, na aplicação sobre diferentes tipos de palha e simulações de chuva

Cited by 4 publications

References 0 publications

Cover Crop Straw Interferes in the Retention and Availability of Diclosulam and Diuron in the Environment

Cover Crop Straw Interferes in the Retention and Availability of Diclosulam and Diuron in the Environment

Residual Herbicides and Cover Crops Interactions for Soybean Weed Control

Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw

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