Teores de água no solo e eficácia do herbicida fomesafen no controle de Amaranthus hybridus

Zanatta, Jocemar Francisco; Procópio, S.O.; Manica, R.; Pauletto, Eloy Antônio; Filho, Alberto Cargnelutti; Várgas, Leandro; Sganzerla, Daiane Cristina; Rosenthal, Mariane D’Avila; Pinto, J.J.O.

doi:10.1590/s0100-83582008000100015

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…In applications of reduced doses of herbicides it is noticed a gradual behavior of plants dry mass and it is inversely proportional; the lower the applied dose, the higher was the plants dry masses, a fact noticed in the applications of all studied products. Similar results were found by Zanatta et al (2008), in which the water content in soil affected the efficiency of fomesafen herbicide on A. hybridus plants, but the level of influence varied with the applied dose. The application of the recommended herbicide provided a satisfactory control of this weed, regardless the soil moisture content, which did not occur when applied at lower doses.…”

Section: Resultssupporting

confidence: 83%

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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This project aimed to relate the control efficiency of ACCase inhibiting herbicides applied post-emergence to Digitaria horizontalis plants under different soil water contents. The experiments were conducted in a greenhouse, with the application of three different herbicides (fluazifop-p-butyl, haloxyfop-methyl, and sethoxydim + mineral oil Assist). The experimental design used for each herbicide was completely randomized, with four replications, consisting of a 3 x 4 factorial, with the combination of water management strategies (-0.03, -0.07 and -1.5 MPa) and four doses of these products (100%, 50%, 25%, and 0% of the recommended dose). Herbicide application was made at two vegetative stages, 4-6 leaves and 2-3 tillers. The visual phytotoxicity evaluations were performed at 14 days after application and the plant dry weight at the end of the study was evaluated. The control efficiency was not affected by water management strategies when applied to the recommended dose of the herbicides in early stages of plant development (4-6 leaf stage). In late applications (2-3 tiller stage) the plants held under drought stress showed less phytotoxicity.

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Section: Resultssupporting

confidence: 83%

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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“…Under dry conditions, the efficacy of PRE herbicides usually decreases (Zhang et al 2001;Zanatta et al 2008); however, intensive precipitation after application of these herbicides can cause crop injury (Stickler et al 1969;Soukup et al 2004). This effect is especially important for sunflower because the selectivity of most herbicides is dependent on the position of the herbicide layer on the soil surface and the distribution of seeds on the soil profile.…”

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confidence: 99%

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Jursík¹,

Soukup²,

Holec³

et al. 2015

Plant Prot. Sci.

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Jursík M., Soukup J., Holec J., Andr J., Hamouzová K. (2015): Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions. Plant Protect. Sci., 51: 214-222.We ranked the most frequently used pre-emergent herbicides in sunflower (Helianthus annuus) according to their efficacy and selectivity under different soil moisture conditions within 2008-2011. The efficacy of oxyfluorfen, aclonifen, acetochlor, dimethenamid, and propisochlor on the majority of weeds (Chenopodium album, Echinochloa crus-galli, Amaranthus retroflexus, Mercurialis annua, and Solanum physalifolium) was only slightly affected by the soil moisture and these herbicides can be used in arid and semiarid regions. The efficacy of linuron, prosulfocarb, and pethoxamid was strongly affected by soil moisture and was insufficient under dry conditions. The majority of herbicides showed good selectivity for sunflower. Crop injury rate of 5-15% was recorded after application of flurochloridone and acetochlor. For flurochloridone, the phytotoxicity increased due to irrigation after herbicide application. The highest sunflower injury rate (27-35%) was recorded after application of oxyfluorfen.

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“…De maneira geral, o aumento do déficit hídrico diminuiu a eficiência dos herbicidas (Tabelas 4 e 5). Plantas estressadas por déficit hídrico, devido ao baixo teor de água no solo, afetam negativamente a atividade dos herbicidas (Zanatta et al, 2008 Sendo assim, a observância de fatores ambientais é recomendado para que o herbicida (aplicado em pós-emergência) possa alcançar maior eficiência, uma vez que o maior efeito é alcançado no momento em que as plantas apresentam elevada atividade metabólica (Cieslik et al, 2013). Assim, o manejo químico é mais eficaz quando não ocorrem condições de déficit hídrico, pois a água disponível no solo e o intenso desenvolvimento das plantas daninhas favorecem a absorção dos herbicidas e, consequentemente, sua ação no controle destas.…”

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Efeito do paraquat e glyphosate sobre espécimes de poaceae e convolvulaceae em condições de déficit hídrico

et al. 2017

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Resumo -O uso de herbicidas é uma prática muito utilizada para o controle de plantas daninhas. Entretanto, sua eficácia pode ser comprometida pela menor disponibilidade de água no ambiente, influenciando na absorção, translocação e metabolismo destes pelas plantas. O presente trabalho objetivou estudar o efeito dos herbicidas paraquat (Gramoxone  ) e glyphosate (Roundup Original  ) para o controle de capim-braquiária [Urochloa decumbens (Stapf) R.D.Webster (Poaceae)] e corda-de-viola [Merremia cissoides (Lam.) Hallier f. (Convolvulaceae)], em condições de déficit hídrico. O experimento foi conduzido em casa de vegetação, em delineamento experimental inteiramente casualizado e esquema fatorial 5×3, com três repetições. Foram consideradas cinco épocas de indução de déficit hídrico (0, 1, 3, 5 e 7 dias) e três caldas de pulverização [paraquat, glyphosate e testemunha (com a aplicação de água, apenas)]. As avaliações de porcentagem de controle foram realizadas aos 2, 5, 7, 10, 14 e 21 dias após a aplicação dos tratamentos. Aos 21 dias foi determinado o teor de massa seca das plantas daninhas. Pelos resultados obtidos, observou-se que a partir de 5 dias com déficit hídrico, a eficácia dos herbicidas paraquat e glyphosate para o controle de capim-braquiária e corda-de-viola foi reduzida. Palavras-chave: Urochloa decumbens, Merremia cissoides, controle químico, cana-de-açúcarAbstract -The use of herbicides is very used by growers for the control of weeds. However, their effectiveness can be compromised by the reduction of water in the atmosphere, influencing its uptake, translocation and metabolism in plants. The objective of this study was to evaluate the efficacy of herbicides paraquat (Gramoxone  ) and glyphosate (Roundup Original  ) for the control of Urochloa decumbens (Stapf) R. D. Webster (Poaceae) and Merremia cissoides (Lam.) Hallier f. (Convolvulaceae) when submitted to hydric deficit. The experiment was conducted in greenhouse conditions with completely randomized design in factorial 5×3, considering three replicates. It was considered five induction conditions of hydric deficit (0, 1, 3, 5 and 7 days) and three treatments (paraquat, glyphosate and untreated check, only water). The evaluations were performed at 2, 5, 7, 10, 14 and 21 days after treatment application. At 21 days, it was also determined the dry weight of weeds. From the results obtained, it was observed that from 5 days without irrigation the herbicides reduced their effectiveness for the control of weeds.

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Teores de água no solo e eficácia do herbicida fomesafen no controle de Amaranthus hybridus

Cited by 19 publications

References 15 publications

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Efeito do paraquat e glyphosate sobre espécimes de poaceae e convolvulaceae em condições de déficit hídrico

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