Weed control of glufosinate, oxyfluorfen, and paraquat as affected by the application time of day

Aliverdi, Akbar; Ahmadvand, Goudarz; Emami-Namivandi, Behzad

doi:10.1590/s0100-83582020380100069

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…In addition to these aspects, the climatic condition can also influence the determination of a synergistic, antagonistic, or additive effect in the mixing of a herbicide with foliar fertilizer; in dry climate conditions and lower relative humidity, as observed in our experiment, the cuticles of soybean plants tend to become thicker and, thus, reduce the possibilities of synergism in the combination of herbicides and foliar fertilizers (MONTGOMERY et al 2017, ALIVERDI et al 2020. HECKMAN et al (1999) have observed that the phytotoxicity in soybeans inherent in the application of post-emergence herbicides (acifluorfen, chlorimuron, imazethapyr, and bentazon) associated with manganese sulfate were not different from the herbicides applied without manganese sulfate.…”

Section: Resultsmentioning

confidence: 74%

Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

Alencar

Geist

Pereira

et al. 2022

Rev. Ciênc. Agrovet.

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A associação de herbicidas com fertilizantes foliares é comumente adotada na cultura da soja. Entretanto, essas associações podem ocasionar diferentes efeitos quando aplicadas na soja, necessitando portanto de maiores estudos. Assim, objetivou-se avaliar a seletividade de herbicidas pós-emergentes associados com fertilizante foliar (FF) à base de zinco na cultura da soja RR (resistente ao glifosato). O experimento foi conduzido em delineamento experimental de blocos casualizados, com quatro repetições. Os tratamentos aplicados foram chlorimuron (17,5 g i.a. ha-1); chlorimuron + FF (17,5 + 693 g i.a. ha-1); cloransulam (40 g i.a. ha-1); cloransulam + FF (40 + 693 g i.a. ha-1); fomesafem (225 g i.a. ha-1); fomesafem + FF (225 + 693 g i.a. ha-1); glyphosate (1.280 g i.a. ha-1); glyphosate + FF (1.280 + 693 g i.a. ha-1) e duas testemunhas sendo uma capinada e outra infestada. Foram realizadas avaliações visuais de fitotoxicidade aos 7, 14, 21, 28 e 35 dias após a aplicação dos tratamentos (DAT), e também nessas épocas os teores de clorofila. Ao final do ciclo da cultura foram determinados os dados referentes a produtividade e o peso de 1000 grãos. A fitotoxicidade foi superior a 30% quando se aplicou o cloransulam e o chlorimuron, enquanto que para o fomesafem e o glyphosate a fitotoxicidade foram próximas a 5%, na ausência ou presença do fertilizante foliar. Não ocorreu diferença significativa para a produtividade de grãos, peso de 1000 grãos e umidade. A associação de herbicidas com fertilizante foliar a base de zinco não influenciou na seletividade dos herbicidas aplicados em pós-emergência na cultura da soja RR.

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Section: Resultsmentioning

confidence: 74%

Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

Alencar

Geist

Pereira

et al. 2022

Rev. Ciênc. Agrovet.

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“…We hypothesize that the plants' ability to recover enzyme activity comes from de novo synthesis of GS, given that glufosinate was not able to completely control these plants when treatment occurred at dusk. This is particularly interesting because GS activity is known to be lower in the dark compared to the light in both A. palmeri (Figure 3) and other plant species [23]. In addition, GS2 is highly expressed in the leaves while GS1 is more abundant in roots (Figure 2).…”

Section: Discussionmentioning

confidence: 95%

Biochemical Basis for the Time-of-Day Effect on Glufosinate Efficacy against Amaranthus palmeri

Takano

Dayan

2021

Plants

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Glufosinate, a glutamine synthetase (GS) inhibitor, often provides variable weed control depending on environmental conditions such as light, temperature and humidity at the time of application. Midday applications normally provide improved efficacy compared to applications at dawn or dusk. We investigated the biochemical basis for the time-of-day effect on glufosinate efficacy in Amaranthus palmeri. GS1/GS2 gene expression and GS1/GS2 protein abundance were assessed in different parts (young leaves, old leaves, and roots) of plants incubated in the dark compared to those in the light. The turnover of GS total activity was also evaluated overtime following glufosinate treatment at midday compared to dusk application. The results suggest that GS in A. palmeri is less expressed and less abundant in the dark compared to in the light. Midday application of glufosinate under intense light conditions following application provide full control of A. palmeri plants. Consequently, these plants are unable to recover GS activity by de novo protein synthesis. Full activity of GS is required for complete inhibition by the irreversible inhibitor glufosinate. Therefore, glufosinate applications should always be performed in the middle of the day when sunlight is intense, to prevent weed escapes from the herbicide treatment.

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“…Therefore, glufosinate performance depends on the time of day at which the herbicide is sprayed in the field. Several papers have reported the time-of-day effect on glufosinate efficacy for several weed species [21,22,23]. One common observation is that glufosinate performance was lower when the herbicide was applied at either dusk or dawn compared to midday applications.…”

Section: Introductionmentioning

confidence: 99%

Biochemical Basis for the Time-of-day Effect on Glufosinate Efficacy Against Amaranthus palmeri

Takano¹,

Dayan²

2021

Preprint

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Glufosinate, a glutamine synthetase (GS) inhibitor, often provides variable weed control depending on environmental conditions such as light, temperature and humidity at the time of application. Midday applications normally provide improved efficacy compared to applications at dawn or dusk. We investigated the physiological, molecular, and biochemical basis for the time-of-day effect on glufosinate efficacy in Amaranthus palmeri. GS1 and GS2 gene expression and protein abundance were assessed in different parts (young leaves, old leaves, and roots) of plants incubated in the dark compared to those in the light. The turnover of GS total activity was also evaluated overtime following glufosinate treatment at midday compared to dusk application. The results suggest that GS in A. palmeri is less expressed and less abundant in the dark compared to in the light. Midday application of glufosinate under intense light conditions in the hours following application provide full control of A. palmeri plants. Consequently, these plants are unable to recover GS activity by de novo protein synthesis. Full activity of GS is required for complete inhibition by the irreversible inhibitor glufosinate. Therefore, glufosinate applications should always be performed in the middle of the day when sunlight is intense, to prevent weed escapes from the herbicide treatment.

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Weed control of glufosinate, oxyfluorfen, and paraquat as affected by the application time of day

Abstract: control of glufosinate, oxyfluorfen, and paraquat as affected by the application time of day.

Cited by 6 publications

References 35 publications

Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

Biochemical Basis for the Time-of-Day Effect on Glufosinate Efficacy against Amaranthus palmeri

Biochemical Basis for the Time-of-day Effect on Glufosinate Efficacy Against Amaranthus palmeri

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